I know I've seen a few of the newer bikes with proportional braking ..... activate the rear brake and "some" of the front comes on ...
I had a Guzzi in the early 80's that pressurized one of the two front disk brakes when the rear brake was applied. I'm sure that modern ABS is a great thing, but I was never comfortable with the old 'linked systems' like the Guzzi.
The pictured system has (relatively) huge added unsprung weight ... and is 'bass ackwards' ... who wants 'forced' rear brakes when you're rear is totally unloaded on a hard braking situation ... that's a no-payback deal on a modern sportbike it seems to me.