Now since we've found ways to correlate the distance and velocity that things are traveling on large scales in the universe, we can actually figure out about how far away the objects we can see should be from us, after traveling 13.8 billion years. This is where the 93 billion light year figure comes from, how far away those "edges" have traveled since they emitted the light we see today.
In 13.8 billion years, light crawled 13.8 billion light years. However the point where it started is now roughly 45.5 billion light years away. Making the diameter of the visible universe 93 billion years.
(In general relativity there are complications about what "now" means between distant points. But suffice it to say that there is a reasonable way that sensible people can agree on to make sense of it, and those are the answers that we arrive at.)
IF this red shift is interpreted as Doppler shift, then we can calculate corresponding velocity and then calculate position of a star at today date, and we will see that visible Universe is expanding. However, we need to point to source of energy for that expanding (with acceleration!). Nobody able to find that source yet.
IF this red shift is interpreted as something else (e.g. loses due to friction), then visible Universe is still.
This is a pretty interesting idea, I wonder if a consistent model of EM frequency damping with distance traveled could be built.
This is not someone in backyard presenting a random set of equations that are not interlinked as a theory. Not epicycles.