It is indeed interesting but the very definition of "universe" is being changed a little there.
Universe means absolutely everything, all encompassing, infinite. What scientists are seeing there is matter receding at a constant velocity
beyond what is perceptible with todays technology. This is slightly different than the "edge of the universe" as the universe by very definition has no edge
So there is "something" a heck of a long way off that is pulling everything towards it at 2 million mph.
Maybe it's the plughole of the universe!
A super massive blackhole even more vast (understatement tbh) than at the centre of galaxies.
Black holes are actually quite hard to spot for todays scientists. There is also the question of "missing matter" to account for current gravitational theory on a cosmic scale, currently known as dark matter.
It's a very interesting topic and you don't need to be Einstein to understand the basics.