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.
That's actually the inciting incident for the cli-fi book "The Ministry for the Future". Overall I really enjoyed the book, was a good mix of interesting economic/policy ideas interwoven through a compelling character based narrative.