With the right context both are pretty good actually. I think the emoji one is most pronounced in bullet point lists. AI loves to add an emoji to bullet points

With the right context both are pretty good actually. I think the emoji one is most pronounced in bullet point lists. AI loves to add an emoji to bullet points. I guess they got it from lists in hip GitHub projects. The other one is not as strong but if the "not X but Y" is somewhat nonsensical or unnecessary this is very strong indicator it's AI.