At least pre AI it was easy to identify if a blog was done due to interest or for self advertisment.
I haven't been recruiting recently but goes it's even simpler to identify blogs full of loveless AI slop and people who care about a topic. (Even if they use AI for language assistance etc)
Topics, which details being presented, frequency, ...
Just look how it goes with GitHub everyone has some BS repos and then also they spam projects to get contributions for CVs.
Hacktober was the worst but I think it went away because of BS spam contributions.
CVE and in general security issues reporting has this issue nowadays where everyone wants to get CVE on their name to have it for CV. It is worst stuff ever.
If you have BS repos but no stars and no followers it doesn’t mean shit.
Imagine everyone having some cookie cutter blog, just a standard part of a resume.