It's one thing when you're correcting someone you're in conversation with and a different thing entirely when you're correcting long-form material with at least some pretense for polish.

I don’t agree. Sending AI generated spam with spelling errors isn’t kind. Traditionally, humans ask to be edited and they deserve that agency.

The person I'm responding to didn't say anything about AI. I don't agree that this kind of thing should be automated like in the OP either. However, as far as I'm concerned, notifying post authors about spelling and grammatical errors is normal and generally appreciated.

OP did mention they're manually verifying every found error, which is the only reason this is even remotely acceptable to do, imo.

Do you understand the difference between these two words? I am asking genuinely, no offense