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In listening to all the discussions of expert commentators on MSNBC, there is no true consensus on what Mueller might be up to in essentially debunking the Buzzfeed report. It certainly has given cover to Trump to brag again that he has been vindicated.
One possibility is that Buzzfeed is a bit of a thorn in Mueller's side. Remember Buzzfeed was the first to release the "Trump dossier" releasing a wave of media speculation. Mueller's team probably didn't like Buzzfeed getting ahead of them, and that wound was festering. Now Mueller may also not want the impeachment talk in the House to get ahead of his investigation, which seems to have maybe another six months to run based on his extension of the grand jury.
Calling the Buzzfeed report "inaccurate" may be a focus on something minor to just stop all the impeachment talk.
Mueller also is very sensitive to possible leaks from his organization. The fact that he took a full 24 hours to respond to the Buzzfeed report may be a result of him doing an internal search for suspected leakers.
In any case, Mueller will have to hurry up his investigation as many very savvy reporters are doing an excellent job of digging. It could be Mueller is not only in a race with the Democratically controlled House, but also the many media organizations who know how to dig. The House investigative committees were never a problem when Republicans were in control, but they are now.