well...i have nearly no practical experience, but i do know a lot of chemistry...

From what I can tell, they're comparing organic semiconductors that they made with an electro-spinning-style process with organic semiconductors that were spin-coated onto a SiO2/Si substrate (the substrate is implied to be just a handy surface to put their organic semiconductors on, it doesn't have silicon transistors afaict)...their process looks like it could be quite useful, if you want organic semiconductors. organic semiconductors generally have several problems when compared to silicon transistors:

1. they are much larger, the resolution you can achieve with silicon is usually several orders of magnitude smaller (tens of nm vs 10-100um).

2. organic semiconductors generally have worse electrical performance than silicon, often by several orders of magnitude -- this is beyond just what the size difference would give.

3. organic semiconductors often degrade quickly (years) vs. silicon which can last tens - hundreds of years. Think OLED screen burn-in.

if you want to build cryptocurrency miners and you care about energy efficiency (hashes per joule), organic semiconductors are a pretty terrible choice, because 1 and 2 combine to give terrible performance and low density.

if you're working with a cryptocurrency where the algorithm changes every week, organic semiconductors might have an advantage, since you could print new ones each week, and hopefully the circuits would be better than a general purpose processor.

Jacob