"All are welcome" is a VERY common evangelical motto. In practice, it is obviously not true.
It's not the quote specifically but the fact that this was his rebuttal to someone else saying he attended a specific bigoted church. Like, the right denial should be "I don't go to the church you're thinking of" not "my church is actually welcoming."
What Pratt said back then was not actually a denial about which church he attended but a denial about their beliefs (which isn't correct in Hillsong's case)