No. The IST means that everybody plays 84 games, instead of 82. That's why every team that didn't advance to the knockout round played that Tuesday, and every team that didn't make it to Vegas played that Thursday (or was it Friday?)
Actually, the full regular season remains at 82 games. Because of the IST, only 80 games were set to start the season and every team played two "flex" games during the IST week whether they made the IST or not. (The championship game does not count towards regular season standings.)
Up until this year, the standard schedule has been as follows:
1a) Home + Away vs each of the 15 teams in the opposite conference (30 games)
2a) H+H+A+A vs each of the 4 teams in division (16 games)
3a) H+H+A+A vs 6 of the in-conference non-division teams (24 games)
4a) H+H+A or H+A+A vs the remaining 4 in-conference non-division teams (12 games)
Because of the IST, the bottom two lines have changed to:
3b) H+H+A+A vs 4 of the in-conference non-division teams (16 games)
4b) H+H+A or H+A+A vs the remaining 6 in-conference non-division teams (18 games)
and we have added
5b) Two flex games during IST week (2 games)
4b) above means that yes, we do play six in-conference teams three times this year, instead of only four last year.
We have three games against UTA, HOU, POR, SAS, MIN, MEM
We have four games against GSW, LAL, OKC, DAL, LAC, DEN
Because of the IST we have five games against NOP, PHO