Steemit produces block every 3 seconds. The last irreversible block (LIB) is found after 14 nodes (2/3 of 21) are built on top of it. So this takes roughly 3X14 = 42 seconds. This is similar to what he said in this video 
In EOS, a block is produced in 0.5 seconds. Following the above logic, LIB will be found in 0.5X14 = 7 seconds in EOS. But this is not what he says. He was always saying finality is found in 1-2 seconds, or 3 seconds sometimes (in this article: https://medium.com/eosio/dpos-bft-pipelined-byzantine-fault-tolerance-8a0634a270ba).
Am I missing something?