A few days ago he sent an email to users of his sites saying they would receive 4 million satoshis (~US$10) just for signing up with Coinbase from the link on the email:

(SAME EMAIL I GOT!)

When I didn't receive anything, I contacted him via his Facebook page (I tried emailing him first but the email info@bitcoinaliens.com does not exist) and he replied saying "Coinbase would send me the 4 million satoshis after they completed their verification which could take some time".

There is nothing else to verify, I've even received and withdrawn Coinbase's signup bonus of 10K satoshis already. What he is doing is taking advantage of Coinbase's own referral bonus system which gives the equivalent of US$ 10 in bitcoin to both the user who invites another user and to the new user, once the new user buys US$ 100 in bitcoins: "Invite a friend who buys $100 of bitcoin or more, and you'll both earn $10 of free bitcoin!" (from Coinbase's site)