Yes, you may politely reference the 2009 Memo at your next INFOPASS and ask them if it applies to you, no harm in trying. And like I said before, I don't even know for sure if there isn't a new memo in place that has since superseded that.
Of course since you only had your interview back in January, that's the pending date your FO is likely to count your waiting period from, regardless of when your bio took place. 5 months is still a lot of time for them to conclude the case and issue your GC.
While waiting, you can ask your congressman to follow up with your FO on your behalf, if you haven't done so already, keep doing monthly INFOPASS appointments if you can. You can also use the service of the ombudsman, not sure that's of any use to DV cases though because of the time constraints involved. Ombudsman info:
https://www.dhs.gov/case-assistance