Two problems wrong with that statement. One, it wasn't a forced sale. Nobody forced Shelly Sterling to sell the team. Not the NBA. Not the courts. And two, even if the NBA had forced them to sell then it's only non-taxable if the proceeds are invested in a like industry within a certain period of time. A like industry being another sports franchise. What league would allow Donald Sterling in as an owner?
Sports franchises are considered part of the entertainment industry. Any purchase of stock or bonds or equity or ownership of any entertainment industry (MSNBC, CBS, FOX, Sony, etc.) or even royalties to entertainment property rights would qualify.