It says "Original Game Supervisor," not simply "Game Supervisor."
So either they're crediting him and HAL for the original game like they credited HAL for it in the March trailer, or he worked on Ultimate sometime in 2016/2017, and so either way he wouldn't be dropping hints all of a sudden. This is still nothing new and I don't know why y'all are acting doom and gloom over "new" info that we actually had this whole time.
Here's the thing, you said Shinya Kumazaki didn't even work on Smash, which I then proved he did. Then you said he worked on Smash's original release and not Ultimate, which we then found to be incorrect as well. Now you're saying he and HAL are being credited for the original game (which I would think they would accredit the original original game supervisor of Smash 64 and not someone else) or that he only worked on Ultimate for a short period and has not overseen the whole project through in its entirety (which is something I agree on).
The point is this man isn't unfamiliar or alien to Smash Ultimate and its development. It is certain that he has had influence over the game in some capacity.
But that does
not mean that the post he made solidifies Brave's identity, nor Erdrick's inclusion to the game. It merely means that it isn't unreasonable and in fact, is rather understandable as to why people would take this as a hint for Brave's identity. Yes it is coincidental. Yes it could very much be nothing. But if we are to dismiss things such as this because it's in favor of something else and not what we want, then we may as well not even bother with any sort of discussion about leaks, hints, or any potentiality of anything outside of official 100% without a shadow of a doubt straight from the horses mouth clear as crystal information.
Now I don't think I'm wrong in saying this, but this is both a support thread, and a speculation thread. So please understand that people speculating about something like this isn't wholly unfounded interest. There are methods to this madness.