That's exactly what I mean - words that we otherwise know are used with completely different meaning, which renders the text unintelligible.
I disagree with you completely that 'most educated native speakers' can understand this. By the same token one can say that most native English speakers can solve differential equations :)
The definition of strain you mention is #30 in the dictionary - http://dictionary.reference.com/browse/strain. Can you cite its use in that meaning in a contemporary newspaper or magazine?