IMHO they say that you should stop looking at CRUD operations and focus on state transitions. Then you map many transitions to specific events. One of them is used to update the object. How it will be updated and what will be updated, the context of the event is determined. It is necessary to update the POST event instead of updating the PUT.
BTW, which solves one problem using pure HTML in REST - HTML does not allow PUT or DELETE to run without JavaScript.
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