No some of this is not true. Westbrook played better with just Lebron on the court than he did with just AD. Especially after AD went out. They were a top duo in the league.
Westbrook + LeBron ON court, AD OFF: 119.8 ORtg, 111.8 DRtg, +8.0 NET
Westbrook + LeBron + AD ON Court: 113.8 ORtg, 112.0 DRtg, +1.8 NET
Westbrook + AD ON court, LeBron OFF court: 119.2 ORtg, 120.2 DRtg, -1.0 NET
Westbrook ON court, LeBron and AD OFF court: 106.6 ORtg, 120.6 DRtg, -14.0 NET
Lakers from 12/16/2022 (AD’s injury) until Westbrook was traded
Westbrook + LeBron ON court, AD OFF: 122.9 ORtg, 112.6 DRtg, +10.3 NET
And in the regular season he’s not a net negative depending on the matchup and pace the opponent plays at. But in the playoffs he is. I noticed he played his best against teams that are higher in pace. But against the slower paced teams is when he struggled the most.