It is true that it's better to rebuild trailer etc. so it looks like for the desktop.
But if it is not forbidden by the Steam's Terms and Conditions... I think it's worth a try just to get some feedback. If the game won't get greenlighted, I still can rebuild it and then try again right? It is also not forbidden to try again. And if with a big doze of luck it gets greenlighted then I will know where to put my priority in the upcomming weeks.
I'm also thinking to make a second video (or even put it as a first) for Greenlight community where I explain what is going on here. That I've made a game for mobile but I got personal requests to release it on desktop and I want greenlight community feedback as well.
I saw people were doing such a videos, like a part of video-blog with a message to the community.