This article is quite a bit misleading. (That tends to be common when journalists write articles about science). The point of the holographic universe idea is that it may be possible to make a mathematical model of our 4D (including the time dimension) universe that is 3 dimensional. In no way does this imply that our universe is illusory or that it is any way a hologram in the sense that we normally think of holograms, namely as an unreal image of some object. It merely means that we can simplify models of the universe by eliminating one dimension. This has very little practical impact for just about everyone alive on earth today. It is very exciting for theoretical physicists, however, because it may allow them to simplify the formulation and solution of various theories, and possibly to use those theories to make new testable predictions.
Gee, like, thanks for damaging my buzz ...