| It is not clear what "it" you refer to here. Referring to SpaceX as a steamroller is a metaphor[1]. "In full force" is, indeed, an idiom that generally means "in entirety", "completely"[2] "Steamroller in full force" is neither a metaphor nor an idiom. It's a mashup of the two, and a phrase hitherto unuttered because it doesn't carry meaning. Put simply, the set of things that can be "in full force" generally does not include steamrollers. Please see Orwell's essay I linked to. "Fascist octopus has sung its swan song" is an example there that is a similar mix of metaphors. There are many ways this can be fixed; steamrollers can gain momentum, for example. As I said - it's not a principal point; I'm nitpicking. However, I believe clear communication is important - so here is an opportunity to improve. -
[1]https://www.grammarly.com/blog/metaphor/ [2]https://idioms.thefreedictionary.com/in+full+force |