I agree with the author of that article. Many times I have had no idea what genre my writing falls under, and have been thinking that I write more along the lines of Soft Sci-fi as opposed to the earlier thought of fantasy / sci-fi. It won’t fit in pure fantasy nor pure hard sci-fi. When I sent a submission to TOR fantasy eight or nine years ago, the return letter read, “We feel it is not right for us at this time”.
Even today I still do not really know what they meant. But I had sent it through their fantasy department and, considering what I think of my writing now, it was a genre clash that was the problem.