I'm having trouble finding evidence of what this user is saying. All the articles and talk I'm seeing indicate that the tag is applied if you use one of the AI powered tools to remove or add elements in PS.
Hope that's all it is, but I welcome other evidence!
As far as I know, Kyle is very against AI - enough that he left his position at Adobe. Unless the PS brushes that he makes and uses to draw and paint is somehow classified as an AI tool, it shouldn't happen.
From my research it's the generative fill tools, and the generative color tools that add this to a document. I posted some art I made a few days ago on Instagram and I can confirm I do not have an AI tag on that export.
Having worked in retail, food, and hospitality (3 different jobs!) I honestly really dislike that saying 😅
But! If you apply the more modern variation "the customer is alway right in matters of taste", then yeah, it works because creatives (ie, the customer base) absolutely hating AI can apply.
Honestly this whole thing is like the New Coke controversy of 1980s, but companies haven't caught on that the masses don't want their new fangled product yet.