I'm just curious, beyond the loss of 65 points.
Thanks Will Jagy.
This is indeed a Brilliant problem which was just released this week, as Manoj Pandey pointed out. You can view it here. I have not come across it on MathSE, otherwise would have made a comment.
The understanding that I have, is that when I spot a problem posed by Brilliant, I would make a flag / request for moderation, and have the moderators lock the problem (just the discussion) for a week.
I do not ask that discussions be deleted, though I would request for individual posters to 'hide' their posts for a week.
I was not involved in the decision to delete the mentioned post.
I would be in the Math chat room for the next half hour, if you have any comments / concerns.