It looks to me like he’s speaking for KJ. Jet’s look at the full quote.
"They're sort of verifying some of the representations by Mayor Johnson about how to produce so much in increased sponsorships, so much in increased ticket revenues," Stern said Thursday night in Philadelphia before the 76ers-Heat game. "And as a result, if the team does come back or stay in Sacramento for another year, it will not only be much better off financially, but it will also give us the time to deliver a deal on a regional basis for a new arena."
The key phrase there is "They're sort of verifying some of the representations by Mayor Johnson”. That tells us that “if the team does come back or stay in Sacramento for another year, it will not only be much better off financially, but it will also give us the time to deliver a deal on a regional basis for a new arena” is in reference to Johnson’s representation.