After some digging I found this:

1) The address that was used to send this message is not the first address that the genesis(the first "mined") block sent money to.

2) The "genesis"/Satoshi address has been used through the years a lot

3) The "Paul le Roux" address is far less active

4) this transaction was made 9 days after the first block was mined

My conclusion here is: Paul le Roux _MIGHT_ be Satoshi, but unlikely, more like very early adopter who either knew Finney, Satoshi or both. But neither can be said with 100% certainty.