Did the refs cost the Cleveland Cavaliers a chance to tie the series against the Boston Celtics?

The Cleveland Cavaliers entered G4 vs. the Boston Celtics trailing 2-1. In front of the home crowd, the Cavs thought they may get a favorable whistle. According to JB Bickerstaff and Darius Garland afterwards, that was not the case. Neither went too far in on the refs, but both made it clear the 24-7 free throw discrepancy is something the league needs to look in to. Are the refs the reason the shorthanded Cavs couldn't beat Boston on Monday night? Or did it have to do more with the fact Cleveland was playing without Donovan Mitchell, who suffered a calf injury in Game 3 on Saturday? Garland, Max Strus and Caris Levert -- and even Evan Mobley -- found their rhythm in Game 4 and kept the Cavs afloat, but it wasn't enough to take down Jayson Tatum & Jaylen Brown. All this happened on the court with LeBron James sitting courtside. What message was LBJ trying to send by attending his former team's playoff game while trying to leverage a bigger deal from the Lakers?