Yeah, no big deal.
"Pro multis" now means "pro omnibus". Black now means white, etc.
Many and all are not polar opposites as are black and white. Many can include all, and all can include many. I'm sure this topic has been bandied about many times before, but the point of the article was to refute the integrist claim that the mass as celebrated today is not a sacrifice.
If the prayers during mass that are said are not to your liking and do not describe and teach the Catholic faith as you would like, the pope has made older forms available, and Mons. Perle has said that even SSPX masses are perfectly legitimate alternatives. If you need to hear "for all" every Sunday, lest you become confused or that your faith is being improperly formed, then I would suggest you opt for those alternatives.