My thoughts on low reps with heavy weights and partial reps, are that they will add power so that on your lighter sets,you can use more weight after a time,also they`ll help strengthen tendons and ligaments.
Personally, I do a full range of motion on everything all the time................ I do half reps on certain movements at the end of a set when full reps are no longer possible,in an effort to extend the set and get a "burn" in the muscle I`m training.
This is not a knock on Dans training, because whatever he`s doing,it`s working as he looks fucking great.
I`d go lighter with a full range of motion myself,but I don`t look anywhere near as good as Dan (Leafy).
If it works,great...........but be careful.