Nah this makes soo much sense! And I’ve never heard anyone suggest it before. It would totally be a thing Beatrice would make up a story to cover for too, whether out of shame or genuine attempt to protect Bojack. This one is getting filed away in my brain for my next watch through!
I know Reddit hates the unreliable narrator theory for some reason, but it makes sense to me (and brings me a sigh of relief)