I think $10M is right. The options cost $0.04 each yesterday (per the tweet), so spending $22,000 would get you 550000 options. Those options are now worth $18.30 (per the tweet) for a total value of ~$10M.
No, the trader bought 260 options. See second photo in the tweet, first row, column "volume". 260 options times $4 equals $1,040 invested, which turned into $475k.