I suspected when watching this first up that it contained way too much salt. I made this yesterday and didn't add the 4th Tbsp when stipulated and it is still salty. Adding the extra would have completely ruined and wasted 3kg of beef and I would cut it back even further to only 2 Tbsp in total. I also found that it did not require the additional water. It would become a very wet curry soup with another 400-600 ml.
With these mods in mind it is however, a very simple and tasty traditional style beef curry. I'll be making it again.
PS: I've just realized that 3 Australian Tablespoons @ 20 ml is the same as 4 UK @ 15 ml. I would still recommend cutting it back and adjust salt to taste at the end stages.
I just watched another youtube video of a different beef and potato curry and while there were some differences, the excessive salt is common to both.