Dn 2 is one of my favourite suttas. It seems incontrovertible that the body (physical) is meant...
"In the same way, when these five hindrances are not abandoned in himself, the monk regards it as a debt, a sickness, a prison, slavery, a road through desolate country. But when these five hindrances are abandoned in himself, he regards it as unindebtedness, good health, release from prison, freedom, a place of security. Seeing that they have been abandoned within him, he becomes glad. Glad, he becomes enraptured. Enraptured, his
body grows tranquil. His
body tranquil, he is sensitive to pleasure. Feeling pleasure, his mind becomes concentrated.
(The Four Jhanas)
"Quite withdrawn from sensuality, withdrawn from unskillful mental qualities, he enters and remains in the first jhana: rapture and pleasure born from withdrawal, accompanied by directed thought and evaluation. He permeates and pervades, suffuses and fills this very
body with the rapture and pleasure born from withdrawal. Just as if a skilled bathman or bathman's apprentice would pour bath powder into a brass basin and knead it together, sprinkling it again and again with water, so that his ball of bath powder — saturated, moisture-laden, permeated within and without — would nevertheless not drip; even so, the monk permeates... this very
body with the rapture and pleasure born of withdrawal. There is nothing of his entire
body unpervaded by rapture and pleasure born from withdrawal.
https://www.accesstoinsight.org/tipitak ... .than.html
The Buddha is obviously talking about the physical body in the first paragraph (there is no possibly reason to think otherwise)... we then have to believe that the Buddha switched 'kaya's' meaning to 'body of mind' in the following section. No warning and no simile that indicates that this is happening.
The meditator is entering jhana at the end of the first paragraph (with his tranquil body (physical))
It amazes me that obviously intelligent people could think the Buddha so obtuse and misleading to think he means anything other than body (physical).