I'm sure if there was an accurate 22000 available, we'd know about it! Chris is known for his resprays, not so much for commissioning new tooling for runs of models, so it's fair to assume that what's in the box is a respray, that's all.
Agreed, railcars are very much the future, as well as the present, so would be something that younger modellers would recognise.
Plus, they're great for somebody with a small layout who feels that a too-short loco-hauled train looks a bit off.