Blooming flowers is a metaphor used by orators from practically every country and kingdom in the course of human history. I don't think this particular formula has anything to do with the hundred flowers campaign, in spirit or in origin. "Let a thousand flowers bloom" has been used by people opposed to heavy government regulation in the tech sector for decades. I even remember the head of FINRA using some variation of the phrase in the Senate hearings on Bitcoin (somewhat surprisingly).

EDIT: Actually, looking into the history of this particular phrase and its use in the West, I may be mistaken here.