Though it's understandable that on the surface it appears that way, it is NOT in fact 'standard procedure' to give a gri-gri to a beginner. Every time belaying is taught (Intro to climbing classes, Junior Program age 10-16, Little Rockers age 6-9, college school groups, lead clinics, etc...) it is taught no different than most other climbing gyms/companies are teaching belaying...with a locking carabiner and an ATC, using the proper hand motion and the brake hand ALWAYS being on the line (the last part the MAJOR emphasis).
Further, anyone new to the gym who chooses not to take the class and wishes to simply take a standard belay test must also demonstrate their proficiency first with the ATC method, and THEN with the VW fixed anchor/Gri-gri set-up.
Hope that helps shed some light on the methods.
Cheers.