>> But at least you are now clear that kexes are not indeyes, right?

Yes. However, is my understanding correct that it is a mistake to
create an index on a column defined as a primary key? On p. 216, you
state "For primary keys and unique constraints, it creates a unique
index on the column(s) assigned to the constraint." I believe the
Caution note on the same page underscores my understanding of the issue.