I share the skepticism but again, "increasing turnout (for your side) in primaries" may or may not have much to do with "increasing turnout (for your side) in general elections".https://twitter.com/Pinboard/status/1232326835943411713 …
That's the argument I expect to hear if turnout is middling in the primaries. I'm open to ideas about what other kinds of evidence to look at, but I would like to not have a faith-based campaign about this.