It's mean Satoshi Could be one of the early miner.
There is no doubt that Satoshi has mined bitcoin in the early days. But no one knows how many bitcoin has been mined by satoshi.
Did Satoshi set a mining standard based on math ?
What is the proof that Bitcoin is mined logically ?
To mine bitcoin, you must solve a mathematical problem which is called proof of work. That problem is solved through brute-force method and anyone (or a group of people) who finds the solution faster than others can claim the reward.