I think the author confuses multiple issues.
Yes, what is beautiful does please. But why should it do so? Because beauty is good and true. Indeed, in classical philosophy, while truth is being as known (the epistemic stance; as it relates to the intellect), and the good is being as desired (the ethical stance; as it relates to the will), beauty is being understood as pleasing (the aesthetic stance; as it relates to perception and to contemplation).
In short: True -> known by the intellect; Good -> desired by the will; Beautiful -> contemplated with delight.
The trouble is not beauty, but the author’s lack of discernment. Is a sentence really beautiful if it is untrue? What about if it is written using beautiful calligraphy? Well, under the artistic aspect of handwriting, yes, it is truly beautiful and true in that respect; but the meaning of the sentence is different from its expressed form (which also has content). The two can vary in truth and beauty independently.
Perhaps this is why we take a certain kind of greater offense at lies told to use sweetly. A course vulgarian is already low and hideous in his speech, and his lies will more closely correspond to the coarseness of his manners in proportionality. But a lie spoken with refinement almost suggests duplicity, between the promise of truth in the beauty of the medium - an honor that is proper to truth - and the ugliness and untruth of the message. The truth should be honored with beautiful expression, but here, it is almost as if we’ve been lied to twice: in the content per se and in the form of the content as a promise of the truth of the content by implication. It is a perversion, which already reveals that there is a normative relation between truth, goodness, and beauty that has been violated. We presume it for this reason.
Now, if someone is undiscerning, he will fail to discern the various elements in play and fail to judge them accordingly as distinct elements. If a man lacks taste, he might even consider beautiful what is actually mediocre or gaudy or ugly. If he lacks what we might call perseverance or a kind of stamina - in short: if he is weak - then he might be unwilling to let go or refuse something pleasing or seemingly pleasurable that is attached to something that may not be so good (for instance, the glutton who cannot refuse the pleasure of good food, even though the excess is killing him).
It’s good that the author at least recognizes his own weakness, but the conclusion at the end simply does not follow. Ugliness is not “authentic” or virtuous or honest. Indeed, by casting it as a virtue, one falls into the same or even worse trap: the presumption of goodness or truth on the part of what is ugly. One will presume that a slovenly interview candidate must be good, because he is slovenly, which is ridiculously stupid. So now you face a new possibility: the slovenly mediocrity. A double blow. And if beauty can work in the favor of a candidate, then why can’t ugliness work against him? It goes both ways.
If we had more beauty - in dress, in manners, in speech, in our surroundings - I think perhaps the “seductive” power the author cannot seem to resist would be less, well, seductive. He would not be so starved for beauty. It would not be such a rarity that he would feel compelled to latch onto the occasional occurrence. What we need is more beauty not less. In the 1950s, no one thought a man in a suit was remarkable. Today, wearing a suit is much less common. In some industries like tech in the last couple of decades, suits may even be viewed with disdain and hostility. The “dress code” forbids them.
W.r.t. poetry and prose, in either case, a fully beautiful piece of poetry or prose does shine forth with truth. In the former case, the beauty of the form takes on a greater significance, but the meaning is still its lifeblood. The form is there to relay the meaning through skillful appeal to pathos and use of imagery, metaphor, simile, analogy, rhythm, and wordplay. The peculiarities of the language used to write it becomes a source of delight. There is more room for flirtation and play and implication. In the latter case, immediate clarity and directness of a more literal shade dominate. The particular purpose of each determines the basis for the beauty of each.