He's basically saying what I said within Twitter's character limit, except without the stats. It's not even close, MJ is in his own realm of greatness unlike any sports icon. In most other sports, there's usually a close comparison, MJ doesn't really have that. Even Wilt declined and MJ until his comeback had a higher scoring average than him lifetime, and in a far less advanced era. Lebron is not in an era advanced from MJs era. The 80s and 90s were just as competitive and advanced as the 2000s, and probably were even more competitive because of how many teams were good.
Even when the Bulls were winning those titles, they never had an easy playoff run, they almost lost a lot of times because of how competitive the league was back in the 90s. Teams didn't just overload their rosters with the best players, and make it a 5 or 6 team race. Right now, the league consists of like 5 teams that have a legitimate chance of winning, in the 90s, the entire playoffs consisted of teams that could give each other a hard time.
MJ dominated in what is probably the toughest era in basketball, and that's what makes it so impressive, and so silly that Pippen could say anything but that MJ is the greatest of all time.