I think the statement adequately answers it. When Soros dumps money into something like this, it is often with the purpose of trying to fundamentally change America. The DA Debacle was an example.
Money changing is a literal description of what Soros did to make his fortune, and if this Republican has otherwise pro-Israel views, I would guess that this phrasing was an unfortunate bit of ignorance about the connotations, rather than an intentional dog-whistle.