No, I'm not mistaken. I've read enough of the Church Fathers to know what they mean by a Vigil. Simply because it became redefined (i.e. extended) later to refer to the entire preceding day, this does not mean that the Vigil Liturgy was celebrated on Saturday morning. Vigil in Latin referred specifically to an overnight watch (staying awake at night).
Who’s talking about the Church Fathers?
I’m talking about the liturgical meaning of the term “vigil.”
Moreover, who ever denied that in the early Church, there was a vigil fire at night?
“Keeping a vigil” (ie., a pius devotional practice”) does not have the same meaning as a liturgical vigil (ie., a day of preparation prior to a designated feast).
Consequently, it is not out of place to have a paschal fire in the daytime, as the daytime is still part of the vigil.
More than this, appealing to the practice of the primitive Church in order to overthrow hundreds of years of organic liturgical development is condemned by Pius XII (archaeologism).
The Novus Ordo could be defended using the same principle.