Information horizons are predicted by relativity, but the point of MiHsC is that their consequences have not yet been included in physics. If you do include them, then you can explain a lot of mysteries, like galaxy rotation, cosmic acceleration, the emdrive and many others..
Imagine you have a glass of, to take a purely random example, beer, in your right hand. Someone pushes your arm and the beer glass moves to your left, the beer spills out to the right and you have to go looking for a mop. Physicists will tell you, "Oh, that's because of Newton's first law that things like to keep going at the speed they already are, so the beer is trying to maintain zero speed with respect to you ...and please pay to get my beer-stained shirt cleaned", but all that is just language, not an explanation.
What MiHsC says is that when the beer and glass accelerate to the left, logic notes that some information from far to their right, limited to the speed of light, will never catch up and an information dead-zone opens up light years away to the right, with a horizon enclosing it. The faster the acceleration, the closer the horizon. The zero point field from the point of view of the beer glass is in the form of Unruh radiation. It is usually uniform in space so energy cannot be extracted from it, but now that the beer glass has accelerated and formed a horizon, the Unruh radiation is damped by the horizon on the right hand side of the glass since some Unruh waves do not fit between the glass and the horizon (just as the zero point field is damped between two metal plates in the Casimir effect) and so more zero point field particles hit the glass of beer from the left than from the right, and it gets pushed to the right (inertia) just as in the Casimir effect more particles hit from outside the plates then in, pushing them together. You're holding the glass so your force opposes this inertia, but the beer responds to the horizon's effect on the zero point field and moves right.
MiHsC also says that this asymmetrical damping doesn't work for tiny accelerations since the Unruh waves get as long as the Hubble scale and so the Hubble horizon (a horizon formed as stars disappear from our view) starts to damp the waves equally all around, so the mechanism I've just descibed fails and so inertia collapses at low acceleration. This accounts exactly for why galaxies don't centrifugally explode like they should according to the old physics. No dark matter is needed.
No dark energy is needed either because the loss of inertial mass at low accelerations predicts a minimum acceleration for nature which looks like cosmic acceleration. The point is that MiHsC is all about information horizons making the zero point field non-uniform, so that unexpected energy can be extracted. An equivalent viewpoint that I'm working on now is that information stored on horizons can be released by 'squeezing the horizon' (an intro) but that's another blog..
A MiHsC Joke:
Traffic Officer: "Now then, Sir. Do you know you accelerated to well over the speed limit?"
MiHsCreant: "Sorry Officer. I was trying to see my Rindler horizon."