Oh, Boko just made that Senri scene casually while he took a mini-break from UFG2 development for New Year's. He's still focusing on UFG2. So we'll have to wait a bit longer before we see Senri in-game.
FYI, he officially put GBH game development on hold in May of last year, and said he planned to return to it once he finishes UFG2. The reason it maybe doesn't seem like this to us, is that he's taken several short breaks from active UFG2 development for various reasons, such as to research RPG Maker MZ or research different animation techniques. Some of this research results in side experiments, like the GBH mini-game with Mena's sister that he put out in October (for example, he studied whether making the Hero's hair shorter there would make certain animations seem less unnatural).
So I expect we'll have to wait until later this year to see CP3 (or whatever the next GBH game is called) from Boko.