@J Fan I see what you mean about it not being the real Thawne, but still I voted for it because it was the scene(s) that made me most excited this season (besides "He... is... COMING") because it gave a strong season 1 vibe. And like Xandermcc said, it is based on the real Thawne after all and is from the point of view of the superintelligent Grodd, so it's at least more accurate than some of the hallucinations/visions of Thawne like in Elseworlds pt 2 and Last Temptation of Barry Allen pt 1, where he becomes somewhat of a caricature of himself. (Though he was great in Barry's reverie at the beginning of The Man Who Saved Central City.)
It's also interesting to see how Barry instantly goes into the headspace of not wanting Thawne to get away with what he's doing, yelling "CAITLIN, DO NOT TRUST HIM!"
I know he said he hated every minute of working at S.T.A.R. Labs in COEX P3, but in The Trap he said he had enjoyed working with Team Flash, and of course there's the Cisco son line, so I imagine he really did grow to like S.T.A.R. Labs and maybe was just saying he hated every minute of it to be dramatic or menacing or something like that.
And I agree with everything you said about Therefore I Am, I also think it's interesting that they refilmed the scenes from the Pilot, so his hair is different and there are subtle differences in the way he says everything, probably as a result of Flashpoint.