The problem with this is, the "factory owners" of the world run a political machine which they use to prevent that from happening, claiming it prevents them from building more factories. They use the same political machine to establish the moral goodness of continued factory building as axiomatic.
This makes everything rather complicated.
And in fact, what you are linking to is a right-wing attack on very legitimate economic ideas. The introduction of the 40-hour week did increase employment, and further reduction of work weeks would indeed increase the number of people employed (as we see already: all job growth in the U.S. currently is full-time jobs being converted into multiple part-time jobs in the service industry).
That is, you've linked to a discussion of something on Wikipedia and you believe that the discussion of it proves its truthfulness; nothing could be further from the truth. See also: discussion of moon landing conspiracies.
In fact, if I fire someone in China and hire someone in Vietnam, I have indeed engaged in a zero-sum transaction - actually a negative-sum transaction, since I'll be paying the Vietnamese guy less than the Chinese guy. Overall, the world economy will be moving slower because of my actions.
I don't believe in things like "the market will sort everything out", by the way. There are winners and losers, and I think society has some duty to help take care of those who get the short end of the stick. But I don't think "don't let the factories move" is the right way to help those people, long term.
