I have a really hard time believing that is anything more than a fairy tale.
Lebron is a calculated businessman and he also isn't stupid about it. Playing a year would be an absolute circus with little to no long term benefit. Best case he has a few good plays and would still makes a mockery of a team (he hasn't played football in 15 years, it would take at least a year to even get back in the swing of things) Worst case aside from being terrible, he injures himself and squanders what could have been many more years of adding to his Legacy.
I can't take this seriously and whoever is passing that information on is probably locked in a room giggling about the people actually pondering it.