That's the best advice.  Why make your plants unappealing to everyone
in order to keep the cat away?  Give the cat what he really craves --
grass.  Grass is a digestive aid.  All indoor cats should have access
to it.

I buy wheat grass in 5" flats at the grocery store ($2) in the veggie
department.  It might be 4 inches high when bought.  My cat loves it.
And we have a pleasant interaction when I tear off a small bunch and
feed it to him.

You can keep the wheat grass in your window or in any bright area.  It
will grow to 6 inches in height before it gets limp.  Then I buy a
second flat and put it next to the first after cutting it right back to
the base of the green part then soaking the flat in a pan of water for
a frw minutes.  It will grow back and be just the right length when the
other grass gets long and limp.  I rotate the flats for a couple of
weeks then throw them away and start over.

Another option is to buy the Chia wheat grass kit (or two of them) and
go that-a-way.  The Chia wheat grass kit comes in a very nice planter
with Sylvester and Tweety on it.

I buy the flats, myself.  A few bucks a month and I have a happy cat
with good plant manners.