It seemed clear (to me) during the call that a capital raise is something they've been considering, but also that Elon doesn't want to needlessly dilute the company. Mainly because he doesn't want his holding to get diluted -- notice how he always buys into any offering and never misses an opportunity to accumulate shares.A couple of possible scenarios for the cash raise I think.
1. Since the call they became worried about cash flow because of the virus etc.
2. Since the call the SP went up so much it looked stupid not to shore up the balance sheet.
3. During the call Elon was quite clear that if they had somewhere that made sense to spend the money they would spend it...perhaps plans in the last few weeks have changed regarding new GFs and/or battery plants.
Side note, I have a feeling that my cheap insurance $285 put I bought back in December will expire worthless on 3/20. Don't ask me how I know.
But as circumstances may have changed in terms of investment and / or development acceleration opportunities post-ER, combined with a ballooning market cap, they might have concluded it's time to do it. Hell, as far as we know, it might have been on their minds since then, but they were waiting for the right time to do it.