Just looking at the Celtics, Pacers, and Lakers schedule compared with last season. Note that this season started one week later than last, and will end about a week later than last.
Celtics:
2022-23: 23 games prior to equivalent week. 4 back-to-backs. 3 weeks with 4 games.
2023-24: 19 games prior to IST knockout stage. 2 back-to-backs. 2 weeks with 4 games.
Pacers:
2022-23: 22 games prior to equivalent week. 4 back-to-backs. 2 weeks with 4 games.
2023-24: 18 games prior to IST knockout stage. 2 back-to-backs. 2 weeks with 4 games.
Lakers:
2022-23: 21 games prior to equivalent week. 1 back-to-backs. 2 weeks with 4 games.
2023-24: 21 games prior to IST knockout stage. 4 back-to-backs. 4 weeks with 4 games.
And since the tournament ended:
Celtics (ignoring "consolation game" during IST week):
2022-23: 4 games, 1 b2b
2023-24: 5 games, 1 b2b
Pacers:
2022-23: 4 games, no b2bs.
2023-24: 5 games, 1 b2b
Lakers:
2022-23: 5 games, 1 b2b
2023-24: 4 games, 1 b2b
The Lakers had a more compressed schedule leading up to the tournament week, but that seems more due to the vagaries and variances of the NBA schedule; last season, Celtics had played 2 more games than the Lakers at the same point in time last season.
Every team except for the finalists played 2 games during the tournament week, with only the Lakers and Pacers playing a 3rd. The extra game does not seem like a meaningful schedule impact over the course of the entire season, which runs the same number of weeks as last season (just shifted a week). If there was one change they could make, it would be to delay the restart of the season until the Wednesday after the IST, giving every team a few days off and a break from the travel grind. This year, some teams restarted on Monday, including the Pacers, who had to travel to Detroit immediately after the tournament final.