Oh hey, you're back I guess? Anyways, I have to say, you were right when you said NU really wasn't prepared for Swift Swim (Adamant) Basculegion, as even defensive Tsareena gets 2HKOed by Wave Crash under rain lol. Even Cloyster is just 2 Adamant Wave Crashes from seeing whatever higher power it believes in. And yes, Male Basculegion is NU now.
https://pokemondb.net/pokebase/416920/what-is-a-good-moveset-for-basculegion?show=418996#a418996
Regarding that Male Basculegion set you posted, do you think you could add Flip Turn as an option over Liquidation. Not sure what Flip Turn is useful for in OU, but in the context of NU, it is useful to deal chip damage from Pokemon such as Brute Bonnet and Avalugg. (Brute Bonnet has Sucker Punch and Avalugg is Avalugg)