Eh, non news.
I personally don't see any definite contradiction.
Brad very well could have been proactive with Bass, seeking him out and asking if he wanted to talk about it. Then Bass might have replied the same thing he said here, "there's nothing to talk about."
And regardless, when we're looking for contradiction in quotes that include pronouns such as "talked about 'it,' " I'd generally like to see some context such as how both questions were asked and how exactly they were phrased.
The better question probably would have been if he has talked to Ainge about it (AKA asked for a trade). If he has, he probably wouldn't tell us because he doesn't live under a rock, but still reporters ask that type of stuff all the time looking for a good sound bite.