But they did. The highlights are an interpretation/definition of the articles. You all are asking for clarification and the document has been provided.
I don't know the source of the highlights image you posted. Would you please guide me to where you retrieved it? If there's an authority notice in there as well, please float it my way. I want to better understand your position, and have a fair chance to correct mine if yours is more convincing.
I see in the contract in cases where definitions are provided, a precursor such as "[term] is defined as" or "for purposes of X, Y is defined as..." or similar, or a relevant section specifically titled as "definition" followed by whatever needs defined. I do not see any definitions in the contract under Article 10.7.
I've got this this notation which identifies explanations to what was once tentative terms as just "explanations", not interpretations/definitions.

In the first red paragraph, second sentence, you'll notice that the explanation wasn't definitive. Rather than a definitive "
does include" the explanation runs with a non-definitive "
could include".
While it's possible I am mistaken, and your position is correct, the bullet points in the highlights you offered are incomplete sentences and/or incomplete thoughts. Additionally, with "etc." at the end, there is no limit to what applies. It's as though it's author
wanted the conceptual force of a bright line rule, but was unwilling to determine
what they wanted that line to be. The result is a big ol' bucket of

.
Taking it a different direction, years ago, we had the "Analysis of Changes" handbook (identified as EL-902-A in the USPS Directives and Forms catalog (PUB-223)) Which included some explanations of a change and maybe some Q&A about the provision. The highlights you've presented, to my knowledge, aren't that either.
Yet one more direction, we turn to the RCAM.

"Exceptional circumstances" here has a definitive "
are weddings;
are graduations;
are significant life events. The red text indicates that these items would only permit
submission greater than 60 days, however, it doesn't promise
approval. While this is great and all, it wasn't at all the position presented in the 2021 tentative agreement.

Since it does not modify anything in any way, it cannot be used as a substitute for the actual contract as a sword (to attack the opposition's position), nor as a shield (to defend from the opposition's position). Yet, to me, this appears as exactly what's happening.
Unfortunately, documents
cannot "speak for themselves". They are not witnesses, nor can one ask a document a question. I cannot ask the RCAM to explain why the explanation from the 2021 tentative agreement that was ratified by certain members does not match the explanations in the 2024 RCAM.
Just like the 603; when new definitions have not been established you go with the old.
As for changes to the 603, old definitions are always obsolete. The only viable definition is whatever is current.
The Employer presents a change in an article 19 meeting. Whatever changes are ultimately accepted are inserted as authoratative into a Postal Bulletin issue, the previous language is replaced in the print, and eventually, a new 603 is printed with a transmittal letter declaring, "All previous issues of Handbook PO-603 are obsolete."
The highlights are essentially a new definition of the new points of the contract.
I disagree here. I'd agree that they are summaries. Arguing using summaries of the contract is not as potential as specifically using the contract text.
Regardless what power 10.7 yields, I hope the outcome is
@Heyyou getting the time off.