[weby]

Historical skills are still practiced as hobby by many people so it should not be that hard to find such people if you look for them.

Thus one can laearn many such skill by spending money and time like any hobby.

Specially crafts done the historical way are quite popular in certain circles.

As for those people in the link doing military stuff, well most such recreations tend to have anacronisms, regardless of how hard they try to be real. But many of the skills one uses for such are learnable..

Want to learn ancient strategy: read history and boardgame them.. (you would still have a familiarity penalty doing them for real ofcourse)

Want to learn to use a sword: Learn the sport skill Kendo.

And so on..