It really is, which is why I find videos like "Kids explain color to blind people" (which is an actual video that exists btw, it's the dumbest thing I've ever seen out of a clickbaity video trying to be smart, and one kid is even like "so you know what an apple looks like right?" or something) so dumb.
Just tried it. I put in the title of some caveman smut book and it gave me back a Ben Shapiro book on mammoth cloning, the other books in that caveman smut book series, and a book about a guy with a cybernetic eye.
It doesn't specifically say it doesn't work, just that it isn't supported. Meaning you can probably get it to work, you're just on your own in doing so.
Honestly they should just stop refunds on flash sale items unless in extenuating circumstances like "This game literally doesn't work for anybody" or "The price literally went back up as I was purchasing it so I paid the higher price"
That workaround though