- WorldWideWeb was not created in 1987. Tim Berners-Lee released it in December 1990, based on a proposal he developed in 1989 [1].
- Windows 1.0 in 1985 did not have hyperlinks. It also did not have overlapping windows. [2] That second screenshot is of Windows 2, (from December 1987) showing the "Help" system, which did use underlined hyperlinks, from 1989.
It makes me question the thoroughness of their research at all.
> What happened in 1993 to suddenly make hyperlinks blue? No one knows, but I have some theories. ... I like to imagine that Cello and Mosaic were both inspired by the same trends happening in user interface design at the time. My theory is that Windows 3.1 had just come out.
What? No! These are grad students working at the National Center for Supercomputing Applications in the 1990s on big powerful Unix workstations [3]. I highly doubt the UI choices of Window 3 were relevant or closely watched by that team.
1- https://en.wikipedia.org/wiki/Tim_Berners-Lee#Career_and_res...
2- https://www.filfre.net/2018/07/doing-windows-part-3-a-pair-o...
3- https://en.wikipedia.org/wiki/Mosaic_(web_browser)#History