While its true and can be proved
1. People are shorter today than 60 years ago...True
2. If you do read a thermometer at less than a 90 degree angle, it will read high. True
3. Adjust temps down, since they must have read them high True
FWIW, when I was trained to read thermometers in the 70's, of course we were trained to read properly, and actually the screens that I was reading, I had to bend over to read them(Likely most people didnt bend enough and if anything they read the temps low)..
This was in the arctic and I recall once the wind was almost 100KMPH, wow that was tough to read....