This advice falls under the general pattern of addressing a relatable problem and offering a solution that validates the reader's intuition without explaining how to make the behavior habitual. Stating what I want to achieve (waking up before my alarm) doesn't help me achieve it.
The author claims to have 'given a lot of thought' to other products. What products? Is pure reason the right approach for deriving solutions to behavioral problems?
The results seem consistent with previous data. There are many recent layouts (e.g. Colemak[1]) which attempt further optimization, but simulations show little actual difference in strain (~5%) between those. They are all better than qwerty in this regard, but optimizing any any more is a clear case of diminishing returns.
It is actually much more difficult to model finger strain that the english language (in terms of n-grams). Subjective assessments vary a lot, and the quest for the optimal layout is bathed in controversy. Beyond switching away from qwerty, the most significant gains will be made by hardware solutions, like using an ergonomic keyboard (such as the very promising ErgoDox [2]). Other optimizations may come in the form of chorded keyers and better predictive technology. In this last case, the Google data may prove useful.