Yes, by observing the quality of the output and means of production. If it's the standard "AI house style" one gets when prompting image models, by which I am immediately and viscerally repelled, then I am confident assuming it's a low effort "typed in a prompt, got a thing, called it a day" result, rather than actually applying some taste and judgement and trying a bunch of different things in different styles and adjusting things until it's something nice.

The art you posted is like the first example. See, someone even made a blog all about it, they enjoy picking that stuff apart. Repetitive AI art created by typing out four words or pasting a Facebook post into the prompt text box is the second. People don't even entertain themselves by looking at how bad it is, they just plain hate it.