The telescope in question was at one point the proposed Sentinel [0] (apparently now the NEO Surveyor [1]), and frankly, even for something like that, I simply don't trust Elon because of its purpose. SpaceX has a stench about it that calls into question everything they're involved in, so long as he's at the helm.
Besides, given the low weight of 1,300kg, NASA is perfectly capable of launching the NEO Surveyor on its own via the SLS [2].