Look at the bigger picture.
Narcissa is tweeting her times out and her fans are ecstatic. She for sure likes the fact that she is claiming the WR for the new OOT any% runs. If you have a comeback, you can have a fall too. The fall might even be because the speedrunning community dosent like the hardware mods and ban it outright and all this work was for nothing.
I'd argue the fall is that Narcissa is still Narcissa. Narcissa wasn't a cow because he lost his WR. That might have played a part in it, but it was the trooning out and doing weird ass streams that made Narcissa a cow. I do agree it shouldn't diminish the fact that he accomplished something, and in a bubble, it could be a sign Narcissa was getting better and trying to regain his pre-cow existence, but it seems like a huge stretch to say just because Narcissa is speedrunning again that he's going to drop the troon stuff and become his old Cosmo self again. I mean, Narcissa was doing speedruns and getting invested in gaming post trooning out. He was doing some random BoTW run categories that nobody cared about and all that Smash stuff. It didn't make him any less of a cow.
I actually think the best thing for Narcissa might be if his newest record is disqualified, because I think at least some percentage of people will come to his defense, and I think that kind of support/validation is what Narcissa wants. If he gets involved in a community again, even if it is something a little 'tism heavy like speedrunning, it could be enough to bring back his old Cosmo side. Right now, it seems like he's still just sitting in the dark grinding out runs with no real human interaction, which isn't exactly what I'd call a comeback.
At the same time, just posting videos and seeming to care about something is a good sign and could potentially lead to an actual comeback, but right now, it just seems too early/generous to call it that. Then again, by cow standards, actually accomplishing anything is arguably impressive in and of itself, so there's that.