It's almost certainly an attempt to stave off the SEC investigation into misleading statements by Elon when he tweeted originally that funding was secured.
If Tesla was actually going private his "Funding Secured" tweet wouldn't be viewed with as much scrutiny. Instead, coupled with his on-going public threats against short sellers, that tweet is now even more likely to be viewed as intentional market manipulation.
This will only continue and reinforce the SEC investigation.
This does this opposite. This is the opposite of 'funding secured', because now he has to PROVE that funding actually was secured. It wasn't.