Borderline deception is a bad way to correct inaccurate knowledge.
And frankly, if I wanted to ridicule the ancients and flatter my own age, I could think of no better way than to make the old stuff look bad.
I would much rather have an exhibit that showed the bare marble, then a conservative reconstruction based on what direct evidence merits (to the degree possible, noting that it is not a complete reconstruction), then more liberal but reasonable reconstructions based on indirect evidence.
I think it is hard to say to what extent there actually is even borderline deception. The internet amplifies random and funny things. In this article (which, we should note, is even-handed but leaning skeptical toward the garish reconstructions), it is noted that the images that have spread are the ugliest of the exhibit. If the exhibit tells the full story, and the internet just amplified the silt bits, that’s not deception on the part of the exhibit.