They already put off the Tour by a few years because of crash, not being the right time, not enough support etc. There werent any more excuses to skip it.
Everyone wants the best riders at the Tour, from every perspective, and it aligning as probably the best prep before the Olympics is a win-win.
Remco is their biggest rider so of course he should be there and try to make the most of it both from a sporting and commercial aspect, but Olympics is what he has the biggest chance of actually winning.
There are many reasons to send him to the Tour and what is the "primary goal" publicly or behind closed doors is two very different things, I believe.