Unfortunately this is a consequence of idiot referees who have never played the game at a decent level and have no conception whatsoever of what happens when a quick player goes down. Of course some players milk the situation and deservedly get booked but, for so many others, it often takes only a slight nudge to send them tumbling because of the pace they are travelling at. But weak referees (unfortunately there are many of them) grab a cheap opportunity to show themselves in a strong light.
Of course there was contact on Dan and if he has no right of appeal then patently this is an unfair rule and needs amending as a matter of urgency.