That's surely one story which fits the known facts. But there's an alternative version of what might have happened. Trump does the fundraiser without really planning the details of implementation. He does intend to make the donation. What I haven't seen yet is the details of the handling of the money, whether donors wrote checks to the recipients or whether the money was routed through a checking account. It's also not clear who determined the recipients--Trump, his aides, or the donors. Once the media got on his case, Trump's people slapped together what was revealed at the news conference.
For the bad case see TPM