I am starting to accept the fact that there will be inconsistencies that can't be explained.
You may find differences in writings and textbooks. Sometimes a writer learned a different way, perhaps from a teacher or another manual that was incorrect. And of course, like all Gregg Shorthand writers, you can slightly modify to fit your personal preference. Some may have learned Anniversary and then Simplified to write the manuals, so they could sill be using both without realizing it.
There is a Gregg Shorthand Expert Speed Studies for Simplified that goes back to the Anniversary edition to gain speed for court reporting or government usage (most of these were in government forms and information).
For those studying ANNIVERSARY
From the dictionary, Anniversary edition:
And for the Anniversary "date" (sorry clipped the word below because the way it's printed):
I wonder if in the version you're learning "date" is a brief from or abbreviation. But Accommodate would not be. And with the -tion ending, that would make it different, yet again. Some word endings DO change the way the outline is written. It's not really an inconsistency, just the rules of that system or version.
"Gregg Shorthand had achieved the most extraordinary success ever attained by any system in the history of shorthand." John Robert Gregg, 1922