The PS was submitted on Christmas, most of the people were not working on these days and the review fall change into old gerrit pages. Reviewers often don't go through more than two gerrit pages, so they don't see the change.

I'd do a rebase to ensure the code pass CI with current code and also push up into review queue. Don't forget that OpenStack is an open community and people work on the code they like to work, they are not forced to review or do any change, if people don't review, please ask polite into project IRC