I don't think removing links will solve the problem, because when shifting to the outside cogs, the derailer will become more relaxed again. (Remember the pic he posted is not of his own bike.) I have nothing at all against removing excess links, but I speak from lots of experience of chains getting thrown off the outside at the front. And my bikes don't have excess links. On my Swift, the only cure was to make a custom pipe-like guide mounted at the chainring to arrest the sideways wave. With the Yeah, Connie had endless frustrations until I fixed that with a little wheel over the chain. With the Birdy, I finally ditched the plastic useless chain guard and mounted proper aluminium guards right next to the chain. Occasionally when shifting to the outside, I hear a satisfying 'ping' and I think, "That's another chain derailment prevented."