One of the many things that differentiates Steem from Bitcoin is that we don't mine the blocks. Steem does not require that block IDs start with any number of leading 0's. This allows us to create blocks quickly and have a more reactive blockchain that is needed for real time social interactions.
Check out the first block ever created on Steem and it will look pretty familiar to those shown in the video. https://steemd.com/b/1 (click 'show raw block data')
RE: I Finally Understand What a Blockchain Is!!!! Watch This Video And You Will Too!