Hahaha!
https://slate.com/human-interest/2023/03/florida-principal-fired-michelangelo-david-statue.html
Hillsdale Charter Rejects Art
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From OP's own article:
"You’re operating from the wrong premise. The teacher mentioned that this was a nonpornographic picture, No. 1. The teacher said, “Don’t tell your parents,” No. 2. So the issue, Dan, isn’t whether children should see these pictures or not. Gosh, we’re a classical school. Why wouldn’t we show Renaissance art to children?"
..."Three parents objected. Two objected simply because they weren’t told in advance. One objected because the teacher said "nonpornography." Nonpornography—that’s a red flag. And of course telling the students, “Don’t tell your parents”—that’s a huge red flag!"
So - not about the slide, but about the commentary offered by the instructor and not informing the parents in advance.