What was the Jazz's record with and without Boozer that year? I see this here:
"His return to the court after missing 44 games due to injury was a quiet one statistically... he logged just over 21 rusty, ineffectual minutes, finishing with just 2 points (1-5 FG), 5 boards, 2 assists, and 2 steals. Fortunately for the Jazz, they hardly needed even those minimal contributions to blow out the Atlanta Hawks 108-89....
That marked the fifth straight win for the streaking Jazz, who pulled their record to an underrated 34-23 and are now just three games back of Northwest Division-leading Denver Nuggets...We’re big fans of free-agent-to-be Paul Millsap, who stands as one of the top candidates for this season’s Most Improved Player Award in averaging 14.7 points, 9.3 boards, 54% FG, 2.1 assists, 1 steal, and 1.1 blocks through 51 games...Because of Millsap’s accelerated development this season and their depth elsewhere on the roster, the Jazz would likely prove a tough out in these 2009 NBA Playoffs even if Boozer were to suffer another setback and see his season end prematurely."
https://www.emptythebench.com/2009/02/24/carlos-boozers-return-big-for-utah-jazz/
Of course, there are a lot more factors in play than merely whether or not Boozer played in a particular game(s). This same article also notes that:
"That they’re 11 games above .500 and still well within striking distance of a 2- or 3-seed speaks volumes about both their depth and the outstanding coaching, yet again, from that old bore Jerry Sloan. Take a look at their litany of games missed:
Carlos Boozer – 44 games
Andrei Kirilenko – 15 games
Deron Williams – 14 games
Mehmet Okur – 9 games
Paul Millsap – 6 games"