It’s hard to say exactly, it’s like noticing when something is CGI in a movie. It’s just kind of off.

The first few sentences gives it away for me. There’s also the filler words.

Also the way it rephrases the sentences. You have:

there’s always that one piece of software, that one perfectly tuned instance, where if it so much as hiccuped, you’d be ready to throw the entire homelab

Then again:

what’s your absolute, non-negotiable, ‘i will personally visit the datacenter if this fails’ self-hosted application

It’s also possible they just write like a bot.