Definitions of test case and scenario
The proposal defines test scenario as "What to be tested?" and Test Case as "How to be tested?".
This is not according to the definition of a test case from test engineering domain (see e.g. here). It contains input, SUT, Init conditions, Variants, test procedure and expected results.
From my POV a scenario is not more than a procedure. It can be part of a test case. Therefore I think the sentence "Test Case: Is derived from a scenario" is also misleading. It´s the other way round.
A scenario cannot define what to be tested. The SUT is what to be tested and is out of scope for the scenario.
I would propose to replace these definitions of scenario and test case by definitions from test engineering and e.g. the OSC 1.0 User Guide (chapter 1.3 "Scope").
Otherwise the proposal will introduce more confusion than clarify.