he is good to learn (about jhana) from but still it is just probably 'information' for you (rather than spiritual food for liberating freedom). like studying about fine wines but not being able to afford to buy & drink the fine wine
his guru Ajahn Chah said, something like, studying not for the purpose of attaining is like keeping chickens and collecting the chicken shit rather than the chicken eggs
as for what you read, it seems you did not understand it
the physical pleasure in the body when observing breathing where the meditator becomes obsessed by it is not jhana. it is a lower level of concentration mixed with delusion
in jhana, the awareness of breathing & all thought actually ends. but yes, jhana is born of letting go
keep studying Brahm on the matter so clear up the Hindu/yoga non-sense about jhana being 'trance'
