Its not to be scoffed at, but neither is it anywhere near what he is suggesting as far as my (rather limited) knowledge of these matters can work out.

For one thing, looking at the terrorhurtz website, that axe is only claimed to be 900kg - worth of force, and if you are having to divide the weight between two axes, which are also horizontal it should be considerably less than the total of 8tons that he claims. Not even accounting for what he can or cant get out of his setup.

As for splinter, clamping works very effectively, but never usually for damaging. Having said that, Ive not seen any versions of splinter past series 6, so cant comment properly.