No, it's not total nonsense.
Firstly and as earlier pointed out I did make a point of referring to "some CSC's." You may not like me being a little vague and it does run against the grain slight as I have an engineering background but we're all adults here and I expect a degree of comprehension on behalf of readers.
There have been a series of new CSC's announcements in recent times often claiming to be the fastest focusing interchangeable camera and lens combination and I do believe them. Of course to be accurate and sure of what they're claiming the manufacturers state a specific body and lens combination and that's perfectly correct to be expected. As I said, there have been a string of these claims in recent times and as far as I remember they've all been the latest CSC and lens combination none of them to my knowledge have been a DSLR and lens combination.
As for focus accuracy I think that the very best CSC are probably more accurate than the very best DSLR's
in any light. I think that the biggest challenge is possibly low light and I've mentioned here before that my lowly GX7 will focus and achieve an accurate lock in almost complete darkness. It takes time to do so but it does it. It hunts backwards and forwards and then the EVF gains up and detail which can not be seen by eye becomes visible and it focuses. I've tested this in situations I'm never going to shoot in the real world... by sticking the camera and my head in a wardrobe in an unlit room. The challenge is there if you'd like to try the same test with your DSLR. Can your DSLR do that?
Instead of arguing on this forum why not spend a few minute Googling some reviews and see what the facts actually are? I'm certain you will find that the fastest focusing interchangeable lens camera and lens combination available today is a CSC + lens.
If I'm wrong you can come back here and crow about it