New Microsoft Planner Premium resource

I think many will find value in the first two articles you have listed.

However, I anticipate your reference to Planner Premium in the other articles will create confusion as there is no Planner Premium Product.

Those with a Microsoft 365 Work Account will get access to Microsoft Planner and be able to craft Basic Plans.

Those with elevated Planner licensing (e.g. Planner Plan 1, Planner and Project Plan 3, or Planner and Project Plan 5) will also have the ability to craft Premium Plans. 

You may want to revisit what you have summarized in the way of feature set. Most of what you have highlighted is only available with the elevated Planner licensing. To confuse things further, the Premium Plan capabilities differ between Planner Plan 1 and Planner and Project Plan 3.

At our organization, this is our go to guide - Compare All Planner Options and Prices | Microsoft Planner