OP is describing something different.
Backlinks list all files that link to this note.
“Tech features” Backlink Panel:
Note 1
Note 2
Note 3
Note 4
Note 5
(Ie “tech features” is in all of these)
But if in “tech features” I have links to Note 2 & Note 4, then toggle to filter the backlink list as:
Note 1
Note 3
Note 5
This allows you to see only notes that link to this note, and excludes links from this note that happen to also link to it.
I think the idea is that the links to files that are already in this note already have “strong” connections to this note and filtering them out will allow you to have a novel view which focuses in, increases chance of discovering links that could be strengthened.