Nah, Phil knows his dad was Italian American, and that Italian and Spanish aren't the same. His whole reason for claiming to be Latina is because J. Lo turned him on. That's it. Nothing deeper than that. Unlike a normal person who would just rub one out, Phil decided to Troon out and go full on autogynephile, because autism. He's kept up the "Latinx" identity because it allowed him to pretend he was a precious little POC and it worked out better for his SJW crap. Deep down, Phil is actually very sensitive about the fact that he's white and is scared that his "friends" will find out. I'm reasonably sure that Toren threatened to out him.
The Jewish thing is interesting. He's both antisemitic and yet still somewhat obsessed with Israel and being Jewish. Famously, at one point he became fascinated with Kaliningrad (probably through his map fetish) and claimed his mother's family was from there because he thought it would allow him to claim to be simultaneously Jewish, German (and thus Nazi) and Russian (and by extension Soviet/Communist) without realizing that all of those groups viewed themselves as separate, not some magical happy family.
And yes, Phil DOES think Portuguese is the same as Spanish, because he thinks everything Latin is the same. Hell he probably thinks Spaniards (and Portuguese) are "POCs" because he is that lazy and stereotypical.