The message of the meme, that someone is so unattractive they can not date anyone at all, is not explicitly incel ideology,

Hmmm, to me it read differenlty: that someone who is attractive doesn’t understand the problems that come with being unattractive, and also it was funny how naively the guy in the bottom row asks “are you sure?”.

I guess, like everything else in life, there’s more than one way to read/interpret something.