Yes, the series is still staged a bit jarring. But this is the first really good episode of the series.
The idea, that the rabbits are looking for Cowslip's Warren AFTER they reached Watership Down maybe a bit odd, but I think, the story writers managed it to make it comprehensible.
Swapping a warren, that has Elil and that's much too small (for the moment) with a big, seemingly safe warren isn't unlogical.
What's also great about this episode is the strange and weird, I would also call it constrained, atmosphere in Cowslip's Warren. The rabbits look like they're on drugs, but why not. That just emphasizes, that the rabbits in Cowslip's Warren aren't living anymore. They're just breathing shells, ignoring their inescapable fate.
And one highlight imo is Silverweed's strange und unnatural story telling.
And even if it wasn't mentioned by the creators, this episode lays the foundation of some great episodes in the third season.