Its probably D +7 like the rest.
The trend is correct but the turnout is way off.
The key thing about this poll is that they sample from the same pool of people every day, so you can get an idea of what the trend is regarding changing opinions as opposed to just sampling error.
The poll has been going since July, and Trump has been up for 50-70% of that duration, but there have been swings and Hillary was virtually tied or ahead From end of July until Sep 11 when she had the medical problem. At that point, the poll swung heavily to Trump until the Access Hollywood tape. Hillary took a brief lead, but the poll has been moving continuously to Trump since the week before the FBI reopening the email case.
Trump now has close to his biggest lead, so he has peaked at the right time.
It also matches historical trends of undecideds going to the challenger 2:1 in the closing days of an election.