I doubt that. It definitely doesn't agree with what I have seen. I know that I have met a lot of other cyclists when touring and also had a few stay with me as warmshowers guests. Of all of them I can remember quite a few carrying 80 pounds or more and a few with well over 100 pounds. I don't recall meeting any that were carrying under 20 pounds.

I have often been a little surprised when what seems to be popular on the forums does not seem to be what I actually see out touring. Granted there may be some bias due to when and where you observe.