When I open an “old” FME workspace in FME 2024 I get the following confusing dialog:

It is related to a Bufferer and what I want to do is use fme_geometry in a subsequent Tester to find out if the feature has become a donut.
So I wondered if “fme_geometry” is deprecated, but it doesn’t seem so.
What is this all about ? What are disabled attributes ? If I leave them enabled: why can I do so ? Who disables the attribute ?
I use FME for 20 years now and I am completely confused.