I'm not arguing that White is a better rusher than Lewis. But White is definitely better than last year, while Lewis is less effective than last year. To proclaim White's stats are "ridiculously misleading" is ridiculously misleading. White has absolutely improved as a runner, though Lewis is still the better option.
In terms of 3rd and long (let's say 8+ as the NFL defines it), White has had 5 rushes for 32 yards, but this is over the course of a 16-game season so it's not a significant amount of rushes. If you remove those rushes, his average drops to 3.95 YPC, still significantly better than his 2.5 YPC last year, though not as good as Lewis's average of 4.3 YPC when removing his 2 3rd and long runs.
On average, White has 9.72 yards to go when he runs while Lewis has 8.89. White averages 4.26 yards, while Lewis averages 4.42 yards. White gets a 1st down on 20.5% of his runs, Lewis gets a 1st down on 21.9% of his runs.
Lewis is the superior player, make no mistake about it. But bashing White because he can't run the ball is just plain wrong. He's done a much better job this season, and you don't lose nearly as much as you did compared to last season.