This game not so much, but in general it's entirely true.
Over Lebron's career his teammates have never won him a series. Any time he's had a couple off games, or just hasn't been quite as dominant as usual, his team's lose. Without him absolutely dominating, his teams never win.
The exact opposite is the case of Steph Curry, who can be absolutely mediocre, the 3rd or 4th best player on his team for an entire series and Golden State still wins because they have an incredible team. Or Kobe who basically played a sidekick role to Shaq for his first 3 rings, who during that 3 year period was one of the most dominant Centers the NBA has ever seen.
Part of this is the style of play Lebron has, and a team with him basically is necessitated to have to use him to the fullest. Everything goes through him, and it's the reason no team he leads, no matter how mediocre will ever finish below 50-55 wins, but it's also the reason his teams have a tendency to fail in the playoffs. In his first Cleveland stint it usually happened earlier in the playoffs because his teammates were complete cack... In Miami, and now again in Cleveland, with better teammates, it happens at the final step. Even though Lebron is an extraordinary playmaker, that necessity of everything running through him has a tendency to underutilize the other stars on his team, which leads to problems against exceptional teams with great teamwork and defense.
People bash Lebron to a ridiculous extent. I don't even like the guy, I think he's a total douche, but he's an incredible basketball player, an all-time great, and has spent the last half dozen years (before this year) as the most dominant player in the world. And it wasn't particularly close.
He's not Jordan. Sure. But no one has been since.