FB's comment is too long to vote, but there a couple key things to note:
1. Romney's vote was tabulated, as an undervote, which is as significant as a McMullin vote.
2. Taking someone to task for not doing enough to support McMullin over Johnson-Weld is a level of political obsession and myopia previously undiscovered.
In my 2016 thinking, I explicitly said that I would have voted for McMullin if I lived in Utah, so I agree with your hypothesis. That was the one case where a third party vote was not the same as half a vote for each major candidate (which is what every Johnson/Stein vote really was).
