This person just sounds like he doesn't know what he's talking about. It's been over a year since I last did the chest puzzle in King's Fall myself. From what I remember though, I think the order was something along the lines of 4123. That was the hidden switch in the far back behind the rocks, then the one at the beginning on the left, then the one to the immediate right, and finally the one up top. The only reason I remember this is because I looked up the order one time one time in Year 2 while playing the raid with a friend. This particular raid I've beaten over 100 times, having gotten through it (or attempted to finish it) with multitudes of faulty teammates. Having mastered every single aspect, it was often a disappointment when it came to players not knowing their stuff on hard mode... oftentimes their excuse being "I haven't done this raid in awhile." If it's been awhile go back to normal mode, relearn the steps, and then attempt the hard mode so people don't have to deal with your crap.