Just because Bethesda can construe what ever they want, doesn't mean it's correct. Established fluff for 100s of years is what most people go on. That is why alot of people have trouble with glittering vampires. People don't like things breaking from tradition or fluff.
Sure it does. If that is what dragons are in TES, then that is what they are. One might use your argument to say that, since TES stars are literally giant gaping holes to Aetherius, that they are incorrect because REAL stars are balls of gas.
Twilight is an example, not of being wrong for misconstruing what vampires actually ARE, but construing them in a way that is Boring and Therefore Wrong. If Twilight had redefined vampires in an interesting way, then there would be few problems.
And considering that Beth's dragons have a whole lot more going for them than their rigid lock-step with the physical dragon stereotype, they can hardly be called Boring and Therefore Wrong on account of their legging.