Perhaps it depends on definitions.
However, I don’t think that position is Biblically defensible.
Christ told the thief that THAT DAY the thief would be WITH CHRIST IN PARADISE.
I’m confident Christ was telling the truth.
“No John wrote this gospel after Christ had risen and ascended.”
True! Christ said it before His Death, Burial & Resurrection and John wrote his version of the Gospel after the fact.
“There are no Saints in heaven. “
Thanks be to God, there are Saints in Heaven. They are praying for you & I as well.
“There will be no one there until after the Resurrection and judgment”
Sorry, I respectfully disagree, especially in light of Ephesians 3:14-15:
14 For this reason I kneel before the Father,
15 from whom every family in heaven and on earth is named,
Also, there is Romans 8:38-39 which suggests something different than your assertion suggests.
38 For I am convinced that neither death, nor life, nor angels, nor principalities, nor present things, 9 nor future things, nor powers,
39 nor height, nor depth, 10 nor any other creature will be able to separate us from the love of God in Christ Jesus our Lord.