User specific column values are visible to all

My goodness… I am all the way back to this point!
While trying to figure out the solution posted by @Wiz.Wazeer I tried again the simpler solution with which I began. Guess what, it seems it is working indeed.
I am using a USC and it is NOT SEEN by others.
I am then using an inline list and filtering by matching a static column with the USC column.

In case you want to check it…