Since Trump won the election, his can hardly be considered a losing strategy.
Trump won. You lost. I lost. We all lost.
This is most certainly not a true statement, either.
You may not like that Trump was elected, but really, that is about all that can be said with certainty. Anything beyond that is pure speculation. Let's compare notes at the end of his administration.
At the level of rigor you are implicitly asking for, we aren't certain the sun will rise in the morning either. We'll just have to check tomorrow.
Also, speaking of comparing notes in the future, take a moment to think back to discussions of years past. Particularly pre-Iraq war, where enough time has passed to clearly see how events played out. You might recall that my prognostications back then have turned out to have been mostly spot-on. Not just what would happen, but why.