Assuming it's provenance can be established, does it not undermine the legal case since it included a conspiracy to lie under oath (as I understand it, but perhaps I misread) as a serious proposal from his litigation funder, and explicit threats to withdraw backing?
I find the idea of threatening somebody to prove they are the holder of billions of dollars of electronic assets and a massive tax liability quite strange.
I don't believe he's Satoshi and I sense the mail originator (-if real) doesn't either. They believe he (the funder) could make money here, and now expresesses doubt that can work.
Perjury won't fix it, but is a stop-loss position maybe?
I find the idea of threatening somebody to prove they are the holder of billions of dollars of electronic assets and a massive tax liability quite strange.