It's not who is doing it but when.
From Guy's answers sounds like mastering is still happening. As it says, they are finishing the master, that will be used to press the copies of the new record. For an autumn release that should be done or at the least the master done, as the logistics of pressing, packing and distribution is what takes more time of all of the operation.
If everything goes fast there's still a chance it goes out later this year but it sounds more likely to earlier next year.