I know I'm probably taking this isekai manga way too seriously, but I would have expected at least some explanation about how a guy who cannot use magic can "delete" spells with some sort of "technique". Right now this feels like a complete asspull.
It's chapter 3. The story has only barely been established, and even still this technique was hinted at in the first chapter anyway. Calling a newly introduced power at the beginning of a story an asspull is hilarious. Although ig if you think about it, any fictional story is an asspull, so maybe you have a point