Well done! I have only skimmed through the short table summaries, not the full text explanations, but it clarified some things for me and I learned something new (I didn’t know you can use transclusion inside a filter like [{Hello There!!created}]), even though after almost a year of using TW I don’t consider myself a total beginner. I’d say there’s value to it for experienced users as well, as a quick reference or reminder. Good idea to separate {...} and {{...}} from {{{...}}}, this helps in explanation.
The official documentation on tiddlywiki.com lacks exactly this kind of explanation, see this issue on GitHub: [IDEA] Have a closer look at the TW "brackets" mechanism docs · Issue #7581 · Jermolene/TiddlyWiki5 · GitHub
I think it might be more worth to include your work in official documentation, that way it will be easier to discover and use as reference. It would have to reformatted a little bit to match the rest of the documentation. Or if you want to keep your version as it is, it will be a good starting point for anyone taking on the official documentation issue.
I see that {{{...}}} are on your coming soon list. Are you also planning to explain other “bracket like” entities, like $...$, $(...)$, <__...__>, pipies | vs exclamation marks ! in transclusions? There are some new things introduced in v5.3.0 and some other are considered deprecated (these do not require elaborate explanations then).
Those Pesky Brackets