Couple of things. 1. They had Tyreek Hill. When he left, the offense dropped a few notches but still top 5 - top 10 easily. 2. The offense has dealt with injuries to key players at times. That's slowed them slightly.
They've won 2 consecutive SBs and now 8-0. They are turning into the Belichick-Brady Patriots and they're getting it done without EB.
And besides that, EB has been terrible since. The Commanders offense was awful with him, then he goes to UCLA and they're not very good there either. By most accounts, he'd make a terrible HC.
But hey, if you still like him after all that, to each his own.