Still doesn't make it a rouge-lite, and your description is almost any video game with huge difficulty curves or spikes in general. With your view, nearly every hard game or challenging game would be a "rouge-lite".
The only randomization SIFU has, is when certain mooks get turned into elite mooks/powered up state where they get a health boost, more damaging attacks, and some extra defensive options. Though certain ones aren't randomized and will almost always go into a berserk state. That's nothing unique to rouge-lites, and nor regular action games. All Sloclap did is the take the dynamic difficulty and random demon spawning mechanic from God Hand and enemies getting Devil Trigger on Dante Must Die. The only difference being in SIFU, the mooks do this no matter what difficulty you're on.