Liberals have believed in this sort of thing forever. Even at the very outset of New World exploration, the whole "noble savage" mythology was taken up by salon-society in Europe as criticism of their fellow Westerner.
So yes, I am sure they expected to find these mummies showed evidence of perfect health and harmony with nature. It's as though they completely missed the pertinent little fact that the average mummy is a person who died in their 30s or if they were lucky their 40s.