Notice they don't give any information about their visit to the address, really.
They don't say whether they believe he was ever at this address.
They don't say they were able to rule out involvement of someone at that address. (And even if they had said they ruled them out, I would still wonder.)
They don't say if they believe their visit yielded any useful information.
It seems so important, this address and their visit. Yet they don't want to say anything about it yet. Wonder what that could mean.