The claim is that out of the blue he responded saying all this.

He is literally responding to it. A post on his notifications prompted him to respond. That is not out of the blue.

That's not to say that invalidates the post, but when someone is prompted to respond that isn't just out of nowhere when they actually do so.

One also cannot ignore the fact that someone pointing out deltas is also being told to "reclaim a huge portion of their life and be a more productive member of society" either.

The claim is that out of the blue he responded saying all this.

He is literally responding to it. A post on his notifications prompted him to respond. That is not out of the blue.