I don't think there's much point to those excercises in breaking a 200 kg plateau if you are a healthy male.
I'm sure there are all kinds of special circumstances that might warrant them (like when you have some chronic physical debilitation that prevents you from deadlifting too often, or, I dunno, if you are really pressed for time or don't have access to proper deadlifting equipment et cetera).
But in general, If your goal is specifically to deadlift more than 200 kg, you should focus on doing deadlifts. Find the sweet spot weightwise where it is heavy enough to suck, but light enough where you can still plug in 5x8 or whatever regularly - try to maximize volume while still staying at a weight heavy enough to matter.
At that level, all other excercises are suboptimal choices that just takes time, energy and mental focus away from what you ought to be doing, which is more deadlifts. They can still have all kinds of other benefits, just not for increasing your deadlift.
At higher levels, say 250kg +, some diversification might be in order. But breaking 200 kg is just about drilling the movement often enough, without injuring yourself. Seems to me most people reach the point where they have to internalize that fact to progress right around the 200 kg-ish mark.