SpaceX's manifest for this year [1] shows 7 US government launches, 6 commercial launches, and 1 SpaceX-paid R&D launch (Falcon Heavy). Yes the US government is pre-paying for some R&D for Crew Dragon, but no, it doesn't add up to 90% of revenue.

[1] https://en.wikipedia.org/wiki/List_of_Falcon_9_and_Falcon_He...