They were blue when I got there and while we discussed how blue was chosen that is the extent of my recollections of the time - that it was discussed but not the rarionale. They were inspired/informed by the range of colors available in CGA, ANSI and early VGA color palettes. You can’t use a color that doesn’t exist on low end hardware.
It would have made sense for Lynx to settle on blue for ergonomic reasons. ANSI blue is a particular shade thats approximated in hyperlink colors.
There's no causal evidence in what you posted.
Sure, the experiments determined blue would be a good color.
But I don't see any evidence that the developers of Mosaic were aware of the research or used that to inform their choice.