It's more about the entitlement on display than anything. And he's still a hypocrite, no matter how you try to spin it.
OtherSlater: "Entertaining me for free isn't good enough! You must only use the sources I deem acceptable, even if those sources cost hundreds or thousands of dollars! And if you don't comply, then your story should be removed from the site!"
"Hey, your writing sounds like it was AI generated."
OtherSlater: "SO WHAT IF SOMEONE USES AI? IT'S NONE OF YOUR BUSINESS! JUST LEAVE THEM ALONE! YOU'RE NOT SMART ENOUGH TO MAKE THOSE ACCUSATIONS! ALSO, I DON'T USE AI!"