In fact, this past December Musser went on Fox news and praised the Trump tax reform as a “generation changing opportunity” according to the Washington Times article I just linked.
That might only mean he was saying what his boss(es) told him to say on tv. It doesn’t mean this article is wrong about his behavior behind-the-scenes.
But I agree that we don’t know (yet) if there is substantiation for this report. Right now it is just one article based upon anonymous sourcing.