A lot of those are GenZ slang not Gen alpha slang.
Gen Alpha aren't going to have their own slang that's not completely cringe until the ladder half gets to highschool. RN they're barely in middle school.
They're just now figuring out what "beat your meat" actually means, give them time, for now/so far everything they've come up with is cringe AF. Same thing happened with GenZ & millennials, first was an adoption & adaptation of older slang mixed with cringe as hell new slang that faded out of popularity, then overtime much better slang evolved.
They're still in that "I'm a potato" phase of slang development.
I don't think being cringe really exists when it comes to kids. They are developing into who they are/will be.
Adults on the other hand like myself I could say can be, because we are supposed to(according to culture) have figured out who we are, so when we do something out of place it is an attention seeking act that went poorly often times. So when I say a bad joke, I can come across as cringy, or even me trying to explain myself here can come across as cringy. But kids, we need to cut them a lot more slack. We shouldn't be punching down on adults either, but if we start by supporting those kids finding themselves maybe it'll grow with time and eventually maybe anyone can say something dumb and not feel like they should shove their head in the sand, but rather feel safe in their own insecurity and be supported by people around them.
Love for those feeling insecure may be the change they needed to not lash out negatively, whether against themselves or others.
Slang can be cringe though, that's the problem. In order for slang to have wide adoption it needs to be highly flexible & versatile and importantly not too cringe to say in an IRL conversation. Just look at the word "cringe" itself, it lives on from the Millennial era with some slight adaptation. It's not that Gen Alpha is inherently cringe, just that the slang they have are too early in development.
Gen Z to me. But I think a lot of gen z terms have a root in things millennials did online in gaming circles and online forums. So it's not "new" but more colloquial in their vocab where in my gen it was niche talk