I think we're cooking on gas now.
He died since the turn of the millennium. He was born before 1/1/52, and he was never top 10 in the Ronde van Vlaanderen.
So, to recap:
You're looking for a Dutchman, born between 1945 and 1951, who has died between 2000 and the present day, and has never been top 10 at a Grand Tour, but has been top 10 at Liège-Bastogne-Liège.