Many thanks for sharing these links. I will either watch the video or just read the transcript version in its entirely. Looks like great stuff.
A hasty search through the transcript pdf - looking for “K2” - suggests that Dr David believes there’s ambiguity about whether trying to get more K2 into one’s system does indeed aid in the slowing (or perhaps even regression) of calcium deposits in the arteries.
Interestingly enough, he does state that it can’t hurt.
But it seem to be no RCT studies in humans yet to rely on. (And yeah, I’d read the Rotterdam study previously and fully agree with his assessment: it’s pretty much bunk given how the data was gathered. Basically useless.)
Regardless, it remains important to draw a distinction between K1 and K2 inasmuch as they are very different in terms of their function (K1 involved in clotting and K2 involved in calcium uptake into bones/teeth instead of into arteries). As such, referring to “Vitamin K” is, in effect, referring to two entirely separate vitamin types with vastly different functions.
Meanwhile, I’ve been making home fermented sauerkraut and absolutely loving it … slathered on sausage, corned beef, and my favorite, hot dogs. We may even be picking up some K2 (MK7?) along the way through those little lactobacillus buddies that I’ve now invited into our kitchen. 
