That’s gossip, possibly from previous tenant’s parties. There was no party there recently and certainly not the night of the murders.
No, actually there was a complaint of noise at the apartment a week or two before the murders.
Those partying in the house said the residents weren’t there and the police (body cam footage now public record) got on the phone with one of the female victims to tell her about the complaint.
It’s not unusual for college kids to throw parties and have people in and out of their home.