$1000USD for a digital cable?

Audioquest Diamond cables are more than $1000USD. I cannot think of any reason that a digital cable would be so expensive, particularly because the reason to go digital is that as long as you can drive the inductance and capacitance, you can make the cable as long as you want. Digital is what makes under-sea fibre lines work.

So, let one consider that the line can be modelled as an Elmor delay line with as an inductor and resistor in parallel with a capacitor to GND. You can then throw in some values and see if it matters how carefully the cable is made; however, HDMI is less than 1GHz, so I would think that 1nS would be enough time considering that you can huge line drivers on the HDMI interface. I am sure that I could design a cable for less than $10USD that would hit electrical specifications.