Why is this an inaccuracy and not a blunder?

I played Bxf1, and it labeled it an inaccuracy, but there is a 4+ point difference compared with Ng4. So why isn't it a blunder?

You were winning by so much it doesn't matter

Yeah, Stockfish is like that. In winning position, just because i missed mate in 1-10, it gave me inaccuracy

it is not even inaccuracy. totally pointless difference. correct move in such a situation is not best-by-computer but one that you can see that maintains the win

the stokfish lies yo it says incurries for blunder too