If we look at the block generation times (starting from block 1), then it's clear that it wasn't just one entity minting Bitcoin. The inconsistent delays between the blocks hint that there was at least some form of miner competition going on. It technically could be Satoshi himself minting from several locations/machines attempting to test how it fares, but it's likely just that there were more individuals involved.

Is there anything even indicating that it was Satoshi who actually minted the genesis block?