it's still on them because lalo was a free man because of jimmyEven if they didn't fuck with Howard there are dozens of other reasons why he could have still gone to their apartment that night.
Maybe sandpiper settles without the prank and now Howard wants to have a celebratory drink with the brother of his former mentor and best friend.
He could have came around to personally offer a Kim or Jimmy a job.
They could have had him over for dinner.
In the end the reason Howard was at that apartment doesn't matter because from the moment he opened the door he was in the wrong place at the wrong time no matter what.
if he had cooperated with the prosecutors/agents at the courthouse instead of lying about knowing him -lalo wouldn't have been out of jail