No it wasn't. Define "serious". What makes one computer user more "serious" than another. The point of the no true Scottsman is that the term is never defined by the statement and so it's completely subjective.
Refuting the initial generalization by saying that no "serious" computer users use their Touch Bar because their computers are closed is nearly a textbook example of the fallacy.
I don't see how much more clearly I could breakdown what happened. Their entire argument was predicated on the fact that most "serious" (replace "true") computer users don't use the Touch Bar because their lids are closed.
I'll compromise. We'll call it the no "serious" computer users fallacy instead of the no serious Scotsman fallacy.