I saw that when I clicked the "what does it mean" link at the end. I recall thinking that trademarks are not, strictly speaking, English words. That would be like saying "microsoft" is a word, because "Microsoft" is a company. That's why researchers in this vein have to review their source dictionaries, and scrub out all the things that met the lexicographers criteria but not the researchers'.

But maybe that is what they are doing. The test was on whether the viewer recognized the string as a word. The comparison at the end was probably just what can be found in the latest revision of the unabridged Oxford English Dictionary. They might be using the results to assemble a word corpus that could be used in other research applications. If that's the case, bravo for not requiring a bunch of research assistants to endlessly pore over word lists.