The post is by Charlie Lee, the creator of Litecoin. He's demonstrating that he indeed controls Litecoin's genesis block (i.e. the first block in its blockchain

The post is by Charlie Lee, the creator of Litecoin. He's demonstrating that he indeed controls Litecoin's genesis block (i.e. the first block in its blockchain). He's demonstrating a very simple, unequivocal way to prove that you own the genesis block. Anyone claiming to be Satoshi can easily prove it by similar means.