I agree that conditioning should be a secondary consideration after design and that the availability of a website or good food in the clubhouse is at best tertiary.
In GM's defence, though, I would say that calling this list the ranking of best courses is probably not exactly what they mean. It is not a list based on GCA, rather, I suspect they mean the best golf experiences, and to the average golfer, the peripheral stuff, for example in the case of The Belfry, the sense of playing a Ryder Cup venue, as well as clubhouse experience and facilities for visitors etc etc are more important than whether Colt's vision is still being properly honoured, or whether a hole is a true Redan or not.
The general thrust of the ranking is reasonable though. Top links near the top, then leading heathland/sandbelt courses, a few more lesser links, and few parkland courses with high rankings. I don't think the precise order is important once you get outside the top 5 or 10, so whether the number 78 is really better than the 84 is unimportant.