In S07E03 of Curb, we hear Jason Alexander saying the following about his character George on Seinfeld:
[Jason Alexander:] The character is unlovable. He is a you know, he's a jerky, schmucky little character. All right? He's just a buffoon. He's so unappealing that to buy that there was a marriage - that's sustained at all
[Larry David:] - All right, first of all, why is he unappealing? People loved the character.
[Jason Alexander:] Because he's selfish, he's stupid, he lies - Yeah, but people he's not stupid. he's abrasive, he's inept.
In an off-show interview, Jason has admitted realising George is based on an alter ego of Larry David after a few episodes of Seinfeld. Is that something Jason in Curb also knows and is he just teasing Larry or is the narrative that Curb's Jason Alexander does not know / realise this?
This is relevant because, in the transcript above, he's basically mocking Larry by extension. Seinfeld's George is based on Larry and by mocking George he's commenting on Larry's character traits.
It's obvious that this is done on purpose in the Curb episode, but it's not clear if the Jason character in Curb does this on purpose or if he doesn't realise this (which is weird because everyone who's seen Seinfeld and the previous Curb episodes do know).