I assume you’re talking about the image with the cello.
Honestly…if we’re grading on the scale of “sexualized depictions of women on the internet” it’s fairly tame. If you want a point of comparison, consider the old ads for Evony and similar slop from that era. Which is not to say it isn’t objectifying–it’s just that the standard set by the internet (and frankly much of the outside world as well) makes anything short of the extremes not really read that way.
On the flip side, if I were visiting the page without the info from your first post, I wouldn’t read it as a joke at all. I would be neither laughing nor offended, just very confused as to why it was there! Sometimes when making a joke, it can wind up too reliant on inside information to make sense to anyone but yourself. I’ve been there before, and I think you’ve landed there in this case.
