Getting back to the original website, it's junk. The author of that site insists that Einstein based special relativity on the concept of fluidic space. However, in "Zur Elektrodynamische bewegeter Korper," Einstein explicitly states that the idea of the ether is totally unnecessary and that all attempts to find an ether have failed completely. Moreover, he provides a theory - subsequently proved by experiment - that explains how things move *without* having to postulate an ether. Naturally, he applied Ockham's Razor and scrapped the whole idea of the ether.