We will never know. Bitcoin as it stands is not new, the idea has floated around libertarian computer nerd circles for decades but no one besides Satoshi created a fully working version and released it freely.
Also, theres a good chance Satoshi Nakamoto is not a single person but a few people. Early forum posts had different writing styles. Just as every person speaks differently, every person writes differently. This could also be credited to early/diagnosed schizophrenia or other brain trauma as well, another possibility.
At this point, no one can ever be Satoshi. No one claiming to be Satoshi is telling the truth. Unless they have access to the god wallet, they are all false prophets. Satoshi cannot return until all the shit coins are banished and the 4th internet age begins. So it is foretold.
Seriously though, I guarantee in the coming years a bunch of people will claim to be Satoshi. Unless they have the god wallet keys, they’re all lying.