OP not a publicly established personality, and the website is new too. So, they have a lot to prove, credibility chief among them, especially since the topic is mental health. Users discovering that some of the things are AI generated leads to a thought that maybe more, subtler things are AI generated as well - like the texts on the website. AI output is currently distrusted, and the companies' treatment of the authors of their training material is frequently questioned. So, this way, discovering AI content erodes trust, of which the author didn't have any to begin with - because they are just starting out!

So that is why AI is a deal. Looks-wise they are good, and they fit their context very well. But they do communicate much more than that, and that makes them iffy for many.