I'd further say it's not a TRUE Scottish tinkering unless you're hand writing machine code yourself and feeding it via punch cards.
Same how you're not a musician just because you had Suno create something.
So, no, sticking to the actual meaning of a thing is not true scotsman fallacy.
In this analogy, the person calling themselves a musician would have to be falsely calling themselves a programmer after using AI to code something. The word used here was "tinker" which can be any number of things. One can "tinker" with business ideas, investment theses, hardware designs, economic models, gameplay concepts, baking recipes, brewing formulas, and more.