Albedo specifically said that she would like any reports of the supreme beings locations to be directed to her first so she can "Verify" before getting everyone's hopes up. Its completely possible her plan is to lead any of the 41 in the new world away from nazarick so ainz can be the sole ruler. there's no reason why needs to kill them. and that intention WOULD make nigredo become her enemy, harming one of the 41 isnt the only reason someone in nazarick would declare her a traitor. are you forgetting pestonya and nigredo were literally on route to being executed for saving some children from demiurge? and albedo wanted to kill cocytus because he lost a battle. there are plenty of reasons that someone would be declared an enemy of nazarick.
If the unit was made to attack the supreme beings pandora wouldn't be on the team (same for many other people in the unit) because he would never attack any of the 41 unless they attacked Ainz, and albedo saying "They want to kill ainz" wouldn't convince him at all.
The only person on that team who would attack a supreme being is Rubedo, and even that is up to question, Rubedo only takes orders from the 41, the only reason she is listening to albedo is because ainz told her to, i find it unlikely that rubedo would attack the 41 (Especially Tabula) on albedo's order.
TLDR; It was never stated the unit was made to kill anyone.