The reports i have heard says he played 13 times as unregistered player so at 1 point per game 12 points looks about right
in which case the reports you are reading are wrong !
He has played 13 times and I am told that for 9 of those he was incorrectly registered as a UK citizen/domicile. Once the mistake was identified he was correctly registered as an overseas player, with the additional documentation required, and so for the latest four Premiership matches he has been fully 'legal'. That is echoed by syndicated Press Association reports I have seen.
As a second observation, don't expect any RFU mercy. Even in the grassroots competitions the RFU Comps folks can be very dogmatic.
My home club played a national RFU Vase cup match and due to last minute injuries etc played a "home from University" player, selected that morning when the injuries were confirmed. He had been at the club since a six year old, all the way to Colts (U18) level, and had been a Hampshire County U18 player.
He played and was duly entered on the match card - two weeks later RFU Comps said he was not registered on RugbyFirst for Cup matches and so the won match was now lost as we had played an unregistered player.
We appealed, showed he was registered as player as a youth for most of his life, but we lost the appeal. You have to re-register any youth members as adults (we now do it automatically at 17 years old) and make sure they are registered for both RFU league and RFU cup comps. It just so happens he is now doing his masters at a University who have a RFU League position (in Hampshire 2 !) and is registered both with them and our home club - which is allowed it seems - crazy. So one week he can play at L9 and the next at L10 or play for the club in League and then Uni in the national cup. He could play in county cup for uni without any registration.