That US stocks were rallying recently was no news. That those are tanking for two days are no news.
But news is that Softbank was behind the recent rally and it was behind the options market.
https://financialpost.com/financial-times/softbank-unmasked-as-nasdaq-whale-that-stoked-tech-rally-before-selloff
So have they profited? Probably will if price continue to increase. But this indicates a ruthless play. And probably they are trying to gamble off losses in their current book.
Won't bode well. Keep watching. KSA still has large investment in Softbank. And Softbank was the worst hit investor in 00's crash. Losses to the point of getting broken ain't alien to them.
Keep watching.