In a conversation with Business Insider, Banks said she arrived Friday and left on Sunday, and that while at one of Musk's properties she saw him "scrounging for investors" after that tweet. The time period covered by her posts would fall in between Musk's odd disclosure, and this morning's explanation claiming that the funding "secured" rested on his belief he'd be backed by investors from Saudi Arabia's Public Investment Fund.
Musk's spokesperson told BI the claims were "utter nonsense," but it remains to be seen whether the SEC and investors who have already filed lawsuits accusing him of fraud over the market-moving tweet will feel the same way.
Update: Tesla and Musk have not responded directly, however the CEO did tweet tonight that he is "excited to work with Silver Lake and Goldman Sachs as financial advisors, plus Wachtell, Lipton, Rosen & Katz and Munger, Tolles & Olson as legal advisors," on the proposal. Also, the New York Times reported that his tweet was dashed off "with little forethought" and blindsided board members.