Board Thread:General Discussion/@comment-26006155-20190131130037/@comment-26006155-20190204225800

PersonThePerson wrote: Uh oh, wrong alert!

That very same dialogue says this: “Let Frisk be happy.”

Therefore this happens before a true reset, before Flowey forgets about the name Frisk. Well, Flowey does remember things between playthroughs too. Just because he remembers who Frisk is, doesn't mean that the game hasn't been soft reset.