I said the turnout is bad for everyone. Each primary has it's own context. Biden doing poorly in South Carolina is much worse for him than, say, California. If Bernie has South Carolina even with Biden, or significantly closes the gap with black voters - you'll call that a win regardless of where Biden sits at the end of the night. And you'd be right.
So don't play games here. Stripping away context is convenient for you, but that's not going to fly with me as a legit counter.
None of this gets to the issue though. Bernie and his supporters are making the argument that excitement and energy are needed to win. Shouldn't that be evident in the primary process? Who else is in the race has zero to do with that argument. Why does a couple extra people running result in these energized folks staying home? That doesn't make sense. There were less very liberal primary voters (who overwhelmingly voted for Sanders) and there were less people 18-44 (who also overwhelmingly voted for Sanders) He's holding the groups he promises to hold, but part of the argument is turnout and so far we have two primaries that show a decrease rather than an increase.
And he will NEED an increase to beat Trump. Hell, he might just to avoid a contested convention.