Using Artscroll to translate difficult and unusual words in the Gemara is fine. It’s no different to the Aruch or to Rashi’s translation into French. No point sitting around for half an hour wasting time (Bitul Torah even) breaking your head over a difficult word that you have never heard of just for the principle of not touching Artscroll.
But to use it as your main learning Gemara for an easy ride, well that’s different. That’s surely not what’s meant when we say ‘La’asok B’divrei Torah’.