[setquk]

You can buy a $10 aliexpress logic analyser and lift data off a high speed bus easily. I've got a rather nice oscilloscope that actually does this.

However there's a massive disparity between that and actually modifying the bus data, pattern matching data going across it, delivering a payload effectively (watch how flakey serial busses get at high speeds), miniaturising and packaging the entire exploit, compromising supply chains and board reviews and inspection.

For an analogy, it's like donning a yellow jacket, necking half a bottle of whisky then carrying a bazooka across the whitehouse lawn.

I don't and never will buy this attack vector. They could have easily infiltrated the chipset manufacturer, but no they went through a huge number of difficult steps which leave thousands if not million of smoking guns around which are all traceable back to the source. Hmm...