Assimilated Klingons? You mean the Drookmani where one of them has Rutherford’s old salvaged implant (from the tease at the end of last season)? I’m assuming after finding and using the implant, Badgey convinces them to jailbreak other AI from daystrom.
Yes, Rutherford’s old implant that was scavenged at the end of the last season, which explains why Badgy is with them because he was in the implant. No Borg I’m afraid and I think they’re meant to be keeping Borg to a minimum or specific circumstances as they’re decimated and in hibernation between Endgame and Picard.