I don't think it is a terrible strategy. I know there are many many teams that do it.
If he tanks, the first half of the season then he can be making a lot of money every week, don't know exact figures but probably close to 500k? Maybe less, maybe more.
I didn't advise anyone to not bother training if I remember correctly. I said that I wasn't training because I didn't think it was worth it. There is a difference.
Even if he loses every game he will still be making massive amount of money. And he will be training 6 players in 2 positions which will get him some solid players that he can keep or sell for profit.
He is currently 17-0 in his division, I think he knows how to manage a roster, economy and tactics, and even if he doesn't know he will learn as he goes.
As for selling his whole team, based on salary he doesn't have any really great players, so he wouldn't get much money from the players even in a good market. So I don't think it will make much difference.