Those look like they have standard scroll wheels, albeit maybe they're wide enough that you could get a continuous scroll by alternating between index and middle fingers. Am I missing something fundamentally unique about them?
A few Logitech mice have an automatically free-spinning scroll wheel. They call it "hyperscroll". They're the only ones with this technology.
My Logitech g500 from many years ago has a physical toggle for detent/freewheel scrolling, and I love it. Precise when I need it, and zooming up or down when I need speed.
That seems like an improvement, but not really what I'm talking about. I'd like a mouse where the scroll wheel is replaced with something you can apply pressure to, and as long as you apply pressure it continues to scroll -- no need for your finger to even let go of it. (Someone else pointed out that IBM released a mouse that works the way I'm describing a long time ago. It was kind of a commercial flop, partly due to IBM being slow to switch away from mechanical mouse balls to optical sensors.)
They have two modes of operation: the traditional one and a free-spinning one.