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But I'd point to RSTHD as probably the best example of a modern and efficient layout, specifically designed for split-hand keyboards. (It's hard to get more efficient than throwing a simulated annealing program at the problem!) Most notably, it puts E on one of the default thumb keys, which allows a whole host of benefits to cascade forward (no same-finger bigrams with E, one additional home row space, etc.). It's also worth reading his list of criteria for a pleasant typing experience which the annealing program used to generate the layout; IMHO this is probably the best breakdown of what an ideal keyboard layout should be that exists anywhere.
Workman is probably one of those more modern and efficient layouts they're referring to. If you haven't read it, Workman's creator does a pretty good job of explaining why the old alternative mainstays like Dvorak and Colemak aren't ideal replacements for QWERTY.