Has there been a shift in proper ellipses usage over the past few years?

I’m reading this one newspaper (magazine??) article from 1993, and I notice that ellipses will have four dots, not three. There are several uses of ellipses, so this seems standard, not just a single typo. I always thought ellipses had only three dots, but perhaps this has shifted? Was four dots the standard at one point? Was three dots standard, but there was a movement for a four-dotted ellipses that this author may have been partaking in? What’s going on here?