I think that "AI generated content" is a very diffuse concept. There is in a fact a continous scale, all from the simplest machine generated content up to the current state-ot-the-art generative AIs. I for one use machine-generated content for my bios all the time, with a self-developed Perl script that takes data from my own database and produces a full biography. I'm improving it all the time, and the output needs ever less hand editing. Given enough time for development, the output of such a script could eventually reach a level that might be called "Ai generated content".
But AI generated content in itself, as I see it, is not a problem. The real problem is the old "garbage in, garbage out" (GIGO) principle. It is really exactly the same problem that we've got already witrh the old machine-generated GEDCOM junk, with reams of sections and subsections which as a rule boils down to absolutely nothing of substance.
If "AI generated content" should be disallowed, it would probably make sense also to disallow GEDCOM imports. And maybe all "machine generated content", such as my own scripted biographies.
I think the real issue is the "fluff" factor, ie. the ratio of text over what might be called substance. Or in plain old information theory speak, the signal-to-noise ratio, which might actually be made into an operational definition of what is wanted in the Biography field of a profile.
As long as the generated text is supported by sources, everything should be OK. But bio text unsupported by sources should never be welcomed, whether it is generated by humans or computers.