He says it for a few reasons, most notably being that he knows it will get noticed and that's what he gets his jollies off on saying edgy/unpopular/anti-hipster things (basically, he's the john canzano of s2).
One thing fans seem to be forgetting (purposely or just out of ignorance) is that the NBA ownership landscape has changed in the last 5 years due to the globalization of the game, and the current TV contract the league signed with ABC/TNT Sports.
It used to be that the teams were sold for hundreds of millions of dollars, and that it made sense that the teams would "dump" salaries to "save money". But A: that rarely actually happened, and B: it's more prevalent (and easier, due to no salary cap) in baseball than it is in any other sport.
Also, like you said, the potential buyers of the franchise HAVE to be billionaires. To assume that they're so cheap that they're going to demand that certain players contracts are traded prior to them agreeing to purchase the team or that certain contracts will be dumped right after they purchase the team, shows a severe lack of understanding just how things are currently. When the salary cap was 50 million, it made more sense to get rid of bloated salaries. But now that the teams salary caps are over 100 million, the NBA has a very lucrative TV contract and (healthy) teams are worth 1 to 1.5 billion dollars?
That's not to say that a new owner might be against the idea of paying into the lux tax, but I'm betting that a potential owner of one of the healthier franchise bases, isn't going to be someone who can just barely make the payments for the team in the first place.