Zero medical is part of the strategy, as well as minimal coaching.
The entire strategy is based on the premise that the only thing that matters is elite cost controlled high rating players. Talent above all else. Coaching matters not at all.
If a player gets injured with zero medical, they're busted. That's it. Trade them away. If they were super elite to begin with, then after a critical injury they may still be all star level. I've seen it happen.
Minimize all other budget categories. Guarantee yourself 30 to 40 mil in prospect money to lock down the one surefire HOF player when he comes along.
Your roster will have the best IFA to come out every season. Is that enough to assure sustained success? No.
Take a look at the rosters of teams which use this strategy successfully. The players will all be big IFAs or other teams' top draft choices. The only players originally drafted by the franchise, in their low first round slots, will be role players like defensive backups, catchers, and DHs.
What truly makes the strategy work, IMO, is repeatedly turning your own former all stars, big money IFAs, and "first rounders" - even if they've been busted - into other teams' top prospects via trade. All you need is one owner who doesn't mind taking on a big contract to put them over the hump, or is just tired of losing and wants a big name player, or doesn't look at the player card too closely.
You get the top prospects AND the top IFAs. For sustainable success, it's more aggressive but more repeatable than tanking your way to an all star team.