If anything, it confirms that successful long-distance testers are nuts, more or less by definition. If you’re going for long distance TTs I can see it makes sense to ride the same (or identical) bike as much as possible so it becomes 2nd nature.
There’s a real old school feel to it (and him), harking back the days when people would ride to a TT with their race wheels on wheel-carriers, swap wheels and race, then swap them back and join up with the club run afterwards.
But I’m still not convinced by the granny ring!
PS – I think I’m starting to want one, it’s nicher than niche; must go for a lie down till the feeling passes.