Hand waved over it in the dialog as far as I could tell, but can anyone even pretend to explain how Reverse Flash is still around at this point? Gotten beyond silly at this point, and even the fuzzy logic of time travel hijinks seems out the window with this guy.
So:
-Killed Barry's Mom, stuck in past, created Particle Accelerator, etc. Eddie kills himself so that RF is never born. SHOULD have wiped him completely, but will pretend that actions from his past/Flash's future still happen through the time remnant angle. With that, somewhat willing to forgive future appearances which happened PRIOR to Eddie's death from HIS POV, but are in the future for Team Flash. Not normal time travel logic, but ok, fine. He should matter less and less, though, because he shouldn't remember his eventual death, doesn't have the experience with Barry that the S1 RF did, hasn't been siphoning power from Barry so is weaker, etc. Should sorta fizzle out.
-Appearances in Legends are all just remnants, yes? So happened prior to his death/non-birth? Then again, he's being chased by Black Flash in that, so that means he's a duplicate instead of the 'original' time traveler, no? Bit confused there.
-How does Spear of Destiny fit in? Shouldn't that have been THE END of RF? It collected all his remnants, destroyed everything, and he didn't even exist after that, no? Wasn't that how it was sold? Of course, that's problematic in that it didn't change the memories of anyone, so if he really never existed, he can't have been Wells in S1, no Particle Accelerator explosion, Flash is created like 10 years later like in the original timeline, no? Without RF, the whole Flash show we've watched never happens. Massive change to the timeline (of multiple Earths now) if Barry isn't active until the mid-2020s, none of the current timeline happens anymore.
-How the heck does the crossover version of RF fit into this? After Spear of Destiny, thought that was THE END of RF. No more. Was supposed to be more important/powerful than time travel, so remnant doesn't make sense anymore. Could have been the Earth X version, as I guess you're only wiping him from existence of a single universe, but since they said explicitly that he was OUR RF, WTF?
-Also, letting him go is stupid. Don't want to kill him, fine? But just saying "eh, just go" mid-fight seems a poor way to win the day. At least knock him out/tie up/whatever? He was still free to screw with them if he chose, what a dumb moment.
Then again, since I can't figure out how he fits in anyway, no idea if he's just going to disappear into the ether when he time travels away, or if he's now existing and loose again...