Upvote:2
From the link you gave:
"In February, a report was sent to Cardinal Tisserant. It concluded that the Syrian rite was seen as foreign to many members of the community. The Cardinal referred to the Pope who gave permission to use the Latin rite with some parts of the mass in Hebrew (including the readings)."
So, the Epistle and the Gospel (and the homily) must have been in Hebrew. But probably not the Canon, otherwise it would not be the Roman Rite. Just a guess.