There are a few broken images there; could those be fixed?
It would be pretty neat if my mac could make a thumbnail of a webp on my desktop, though. I mean without installing software, overriding security policies, or turning it into a developer laptop.
I used imagemagick to convert this file into a gif, resulting in a 119,265 byte file. I then ran the result through gifsicle[0] with maximum compression (-O3) to losslessly optimize it, producing a gif that is 29,711 bytes; less than half of the size of the original webp.
As I noted higher on the comment chain, this usage scenario is particularly favorable to the gif format, while webp might come out ahead for photographic sources.