I don’t think the hiding links thing is quite working correctly at the mo.
Sections hide just fine for me, but I can’t hide individual custom links when I convert them to lowercase and dashes.
But the official links seem to need lowercase. So they might be handled differently.
However - they work if the full title text is used (with spaces and capitals). So maybe only the OP (can it be wikified?) and the instructions in the TC need to be changed. Or maybe a core change is needed for consistency.