It's little ol' me, the originator of all this hullaballoo. I just drove through the area in question again, and, yes, the left exit ramp to westbound I-66 is still closed.
That interchange has always been a little strange, with a single right side exit to eastbound I-66 and ~2~ exits, one left side and one right side, to westbound I-66. And trying to keep track of where all the exits to all of the interchanges on I-495 in Virginia with all the construction is mind boggling!! If I could actually see a set of plans, I could probably keep track (before I got laid off I used to design roads and storm drain systems).
Anyway, I want to thank everyone who's kept up with all the back and forth on this. It's good to know that there are actually people who do care about making sure the system works as best as it can.