So, if you're new to touch typing, I think this setup *could* work for you since it is like ergonomic positioning on a standard keyboard but the idea that it gives more "wpm" is stupid. You have to move your fingers more for certain keys whereas the homerow has a distance of 1 key moving most of the time. Punctuation is used quite a bit so bjip has to move greater distances inward to press ,. / ' than if you were using a standard setup. In the end, if you get used to using all your fingers using your positioning, it doesn't matter if you feel like using that "ergonomic" one.
Also for the elbow thing, I have my keyboard and mouse pushed back at least 10 inches on the desk so it isn't much of a change for me. So I assume that is what the guy meant instead of a keyboard tray like many other people.