Not trying to be snarky, and perhaps it wasn't well stated, but the last paragraph I said I'm concerned about identification via my writing style. If they have my emails, they would have my writing style. It doesn't have to be tied to PII there, they can cross reference it with my blog. I'm speculating because I read that you can identify people by a few sentences of their writing.

"Deidentification" seems really murky and imprecise at best.

You have to trust that this really "deidentifies". Time and time again it was shown, that the measures taken were not enough to anonymize.

E.g. the parent wrote that he fears, he could be identified by his writing style, which is totally plausible. How would you "deidentify" this?

Even before LLMs there were multiple papers written about ways to to reidentify people with ML and other statistical analysis. It is probably now even more trivial especially if you are Google.

No such animal.

I have a bridge for sale, hardly seen use, pay me ${money} and you can collect it in New York City. Interested?