Interesting to see how the same basis "ebauche" is treated and worked differently depending on the brands. Very personally I like the GP well, using the "Pont d'Or" to sustain the balance wheel.
I agree anyway that now with large groups (e.g. LVMH) holding a handfull of different brands, the R&D made on movements is usually done by the most specialized branch / brand and then can be easily spread to other brands.
The whole in-house movement is a far from obvious definition, but what about the "Swiss Made", movements assembled in China, box and most of the components coming from China, then, a Swiss employee puts everything together and you are "Swiss Made".
In this case most probably all the brands worked on a common ebauche and designed as per their ideas / wishes. Does it make them not "in-house" I would tend to say so, does it diminish the value of their watch, certainly not.