Based on the latest report from Dice/EA/BF6, seems indeed like they're detecting hardware-based cheating as well: https://store.steampowered.com/news/app/2807960/view/4972134...
Although who knows, they might be outright lying about that just to scare cheaters, but I tend to default to assuming what they're saying is more or less true.
They can’t detect me splitting my hdmi output, feeding one of them to a separate machine with a vision model to detect what needs to be detected and the same machine moving and clicking the mouse. People are already doing this.
Looking at the accessibility alternatives they suggest, they were probably detecting XIM users, not the much nastier PC stuff like DMA cards.