Do you think an antagonistic character necessarily needs a redemption just because of an episode which revealed why they’re doing their own wrongs?
Such as the SpongeBob episode, Friend or Foe showing Plankton's backstory of how he and Mr. Krabs used to be friends which also shows how he thought of stealing the krabby patty secret formula in the first place,
and the Harvey Street Kids episode, Raccoon Hoarder Picture show showing the raccoons misunderstood sides as it showed the reason why they were stealing stuff around Harvey Street which was not because they were being mean, but it was actually for their hideout such as that they stole for their raccoon babies to play with? (plus not to mention the first Season 2 episode of HSK revealing that Zoe framing the raccoons to make Audrey hate on them by putting one under Audrey's pillow is the reason why Audrey has been going against the raccoons ever since)
Both of those being instances yet Plankton and the Harvey Street raccoons never got a redemption.