I find it interesting that they author references Skype circa 2012. It sounds like classic "uppercase A" agile: they reframe success as shipping and hitting other invented agile milestones, while masking shipping lousy and incomplete product that is not succeeding in the market. That was right around the time Skype started being bad. It may succeed on some metrics because MSFT started bundling it, but anyone that actively used it at that time should know what I mean.
The idea of an "agile enterprise" is intrinsically absurd. Teams are agile, not companies, and teams and products should be loosely coupled. That's why the big tech companies in this link have converged to similar answers to this problem (they are not "agile enterprises" but give teams some latitude to solve their own problems, and rather focus on results). Kanban is better in most ways for most teams.
Also, Tuckman is a silly model that is only popular because it rhymes.
PS: Strawberry-Jam-O-Meter and a Wrong-Order-O-Meter and their descriptions could hardly be more cringe inducing. Skype should be a part of the curriculum looking at less than ideal acquisitions and post-acquisition execution. https://www.wired.co.uk/article/skype-coronavirus-pandemic has is a reasonable overview if you're not familiar. They lost the consumer market and failed at enterprise (see Teams) and Teams in turn essentially failed in the general market- where most places that were free to do so went with Slack.