Those services only skip one station, Moor Park, and no Chiltern services have ever called there. The other stations it passes only have platforms on the underground side, so don't really count
Chiltern (Line/Railways) services ceased calling at Moor Park
regularly in 1993. 'Never' is patently untrue.
It has happened (albeit on an unscheduled basis) sporadically since then. I have both boarded and alighted a Chiltern service at Moor Park.
During the peak there are a number of Chiltern services that run non-stop between Marylebone and Great Missenden, or Amersham and Marylebone.