I wish it was all an elaborate joke, but unfortunately it's not. The rest of that site is just as perplexing and appears to cater to the same sort of people who believe in psychics. Here's one example:
Actually it is quite fun to do thought experiments on what a flat earth would be like. I think (not a physicist) that the sea and atmosphere would end up dome shaped, centred on the centre of the disc. Non symmetric continents would cause instability so can't exist. I wonder what is on the other side?
For even more fun why not (re)read Sir Terry's oeuvre. Pissing yourself laughing is good for you.
From my limited observation of flat-earthers on YouTube, they at least seem to be willing to do measurements but then either misinterpret the results (due to lack of knowledge) or knowingly twist them to say what they want to say.
Audiophiles on the other hand seem to reject the whole idea of taking measurements.
sadly, no, there is a $10,000 1000BaseT ethernet cable that is a real product. Never underestimate the gullibility of a certain segment of the population.
[0] http://www.machinadynamica.com/machina31.htm