I defined a schema that included this:

extended_schema(WINDOWS, [
    Column("comment", TEXT, "Remarks or comments associated with the group"),
])

And when queried (on a Windows 10 system):

.schema foo
CREATE TABLE foo(...`comment` TEXT HIDDEN, ...) WITHOUT ROWID;

So, I don't know if the platform detection isn't working or if I used the wrong identifier, but it seems like the column is hidden for the very platform I want it to not be hidden on.