The African FGC seems to be full of scrubs from what I've seen from interacting with them online and reading @ilitirit 's posts on the subject.
The guy didn't really ask questions but exposed his theory about how whiff punishes work in SFV and insisted he was right even when people pointed out he was misinterpreting the very nature of whiff punishing. He never asked if whiff punishing is hard in this game and said that "99,9% of the time" it only happens if the opponent whiffs a button after that your blockstring pushed him too far. You never attempted to reply to this very statement but instead went on with your lesson about how "traditional footsies" don't exist in SFV.
The fact he approved what you're saying doesn't prove anything since he barely understands the concept of whiff punishing. He probably just did that because you said you agreed with him.
e can only try placed moves/prediction moves in the hope of stuffing an opponent button .