I believe you are correct, all? 2.3 versions work.

For my S7, as far as I know, Huawei released several different versions of 2.2 for different countries (none for the USA to date). Of those multiple versions, Netflix only worked on the Brazilian version. I had downloaded several prior versions of Netflix (from xda, etc) and none had worked on the rom I was using for my S7. It was a heavily modified version which included several new things from the Slim rom (framework stuff).

Netflix must have changed something regarding the DRM libraries (or checks?) as the prior versions didn't work on the S7 and the 1.3 does (without changing anything else on the S7). Fired up the prior version, crashed out before playing the movie, installed the new version over the old one, movies now play.

Perhaps a lot more of the 2.2 versions will work now? Old version I had was 5.4MB, new version 7MB. Perhaps the libraries are (partially) included? Just saying if you have a 2.2 device that it didn't work on, it may be worth trying the 1.3 version.