The only time Teak is ever mentioned again after the Bath scene is during Cooper's Rescue Mission. Where he desperately wants to get over to where the giant monster is, until he forgets all memories of Teak and get attacked. Which mean he was the giant monster and he's gone for good, unless they have Luke pull some Groundhog Day shenanigans and rescue him. I say good riddance to the racist.
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Spoiler!!!
There is an inversion effect when they talk about him, that's the same inversion effect that happens on rune's backstory when they talk about someone who was corrupted. That means he was corrupted, so the racist is gone for good!
Also, it's implied he was the one who severed the cables at the station, causing the shutdown.
I kinda hope he at least gets a scene where he regrets his actions against the MC before being corrupted, idk