A few people have in the past said the same thing about can mylog be trusted, I searched and couldn't find a flight and then realised they had a filter on for a specific time date.
We have found nothing to indicate aircraft are not added in MyLog.
Regarding AF1, if the aircraft sends out a Flight ID and you get it then a new flight is added to the flights table. So in this case the Flight ID was never received and hence the Flight was not added to the Flights table.