It's pretty clear the developer blocked him from the @iceblock.app account because of the blog post criticizing him, and then blocked him from the other account after he said to not respond but got a page of text back instead. It had nothing to do with the vulnerability report.

Now, the blog post seems to be reasonable criticism to me so I don't think the developer should have blocked him for it. But I don't know, no one has ever written a blog post about me, and I'm not receiving death threats and being threatened by the federal government.

At the end of the day, the author is trying to frame this interaction along the lines of, "Sensitive user data is at risk, and I was blocked for no reason other than for letting the developer know" -- the first part has not been proven to be true, and the second is obviously not true.