The short answer is YES, they lie or more correctly they mislead.
Ski TV once visited RMR and they asked the Operations Manager about the annual snowfall. His response was that they have heard anecdotally that the Selkirk mountains get 40 feet. Yup, most of the Selkirks do get 40 feet, but not Mt McKenzie (RMR). Since RMR bought both the former Cat ops (upper Mt McKenzie) and small ski area (lower Mt McKenzie) you would think that they would be in possession of these companies' snowfall records from past seasons. So they should know how much snow that they get. Is there a businessman out there dumb enough to buy a mountain and invest millions without knowing snowfall numbers?
I have seen magazine articles claiming 500 inches annually, more inaccuracy.
Right now RMR is claiming annual to date snowfall of 447cm and an Alpine base of 162cm. The difference between these 2 numbers is due to snow settling but this seems to me to be a huge difference between the 2 numbers. So not only are they likely counting snow that falls prior to opening for the season, I suspect that RMR counts every flake that falls in September and October, some of which melts long before opening day.
The upper mountain probably gets around 30 feet from mid November to mid April which is one of the higher snow falls among B.C resorts, so why the deceptions?