What he describes as enjoyment sounds to me pretty much like pleasure as envisioned by Epicurus.
Definition of enjoyment (all definitions from Merriam-Webster online):
1a) the action or state of enjoying
1b) possession and use: the enjoyment of civic rights
2) something that gives keen satisfaction: the poorest life has its enjoyments and pleasures
Definition of enjoy:
- intransitive verb: to have a good time
- transitive verb: 1) to have for one's use, benefit, or lot; experience: enjoyed great success 2) to take pleasure or satisfaction in
Definition of pleasure: (Entry 1 of 2, noun)
1) desire, inclination: wait upon his pleasure— William Shakespeare
2) a state of gratification
3a) sensual gratification; 3b) frivolous amusement
4) a source of delight or joy
Definition of pleasure: (Entry 2 of 2, verb)
- transitive verb: 1) to give pleasure to: gratify; 2) to give sexual pleasure to
- intransitive verb: 1) to take pleasure: delight; 2) to seek pleasure
Definition of pleasure: (from Oxford Languages online)
- a feeling of happy satisfaction and enjoyment.
From this quick Google search, I'd say that the author's choice of words is somewhat sloppy. Then again, the English language doesn't seem to be very specific when it comes to these ideas. Might this point to a cultural lack of appreciation of pleasure and enjoyment? I wonder how these concepts are expressed in, say, French?