That's correct, but it's an indication that the NFL is open to drug reform. It's also not well known that the threshold was changed.
They raised it to make certain that there was zero chance of failing due to 2nd hand smoke inhalation or anything like that.
The wacky thing is that players failing tests is detrimental to the league (owners) as well as to the players that fail. They don't have to pay them, but when star players or fan favorites are out, it's not good for the league. Also, the negative publicity is not good either.
As you mentioned, the problem is that the owners don't want to give it up without getting something significant back from the players. The problem with that is that the players that don't smoke weed, will not want to give up anything (money, etc..) in exchange for no testing. The NFLPA representatives from the teams are probably the guys least likely to need to smoke weed.
Some NFLPA reps:
Cowboys: Dan Bailey
Browns: Joe Thomas
Packers: Jordy Nelson
Dolphins: John Denney
Saints: Thomas Morstead
Raiders: Lee Smith
Bucs: Ali Marpet
The NFLPA website is interesting:
https://www.nflpa.com/active-players/drug-policies