I think some of those fungi on wood will grow on people. wash hands and do not touch your eyes, mouth, nose or any other orifice .

You think wrong. If anything the fungi will give your immune system a boost.

I think it's about time you stopped spreading misinformation and fear of fungi.

Is cutting firewood to such a short length fairly common in the UK? I've seen several channels with seemingly short firewood as compared to how I typically see it here in Canada, where it is usually 14-16 inches in most cases, with some people cutting it closer to two feet long. (~35-40cm, and 60ish cm.)

I guess it all depends on the size of your grate or stove. Lots of people in the UK have small efficient wood burning stoves which typically take logs up to 12 inches long.
I find many things are bigger in Canada than in Europe!
What I would say is that trees in the UK are often knotty and crooked so splitting long lengths is difficult, especially if you wait for them to dry out before splitting – in my experience most species split more easily when they are freshly felled. Of course they also season far more quickly this way.

Unfortunately are fires aren’t that long and wood is very expensive

The guy loses some credibility right away when he points to wood that has fungus growing on it as being nice quality. That's a massive fail right there, and a definite signs that drying conditions aren't adequate. Split your rounds and put them in a sunny places exposed to the wind and you won't have that, and the firewood will be dry for next winter if cut in the winter or early spring when the sap is down.

TheodorEriksson that caught my eye too.

Here in Bulgaria, it's normal to cut wood around a foot long, this can then be used in a stove or fire, after it's split.

People have different ideas on how to dry out firewood. My own preference is to cut into blocks soon/immediately after felling, and then split to the appropriate size. Letting the wood dry out before splitting makes the work much harder. Green wood, in my experience, splits much easier. A fungus would indicate that nutrients are being removed from the wood, which would decrease the energy value when it is being burned. Does that make sense? The woodstation looks like a very effective idea.