I respectfully disagree. When refering to any of the apostles, it was as “one of the twelve” differentiating from the rest of the disciples. Judas was counted as one of those. When it said that Jesus say Cephas “one of the twelve” it doesn’t say he SAW the twelve, but saw Cephas, one of the twelve. Jesus was seen by about 500 people after his resurrection, not just the twelve.
Consider this verse:
Acts 6:2 Then the twelve called the multitude of the disciples unto them, and said, It is not reason that we should leave the word of God, and serve tables.
Who is included in this group of twelve? Paul wasn’t saved yet, so he’s not the twelfth. Judas is dead, so the writer of Acts (Luke) also acknowledges that there is a “twelfth” apostle. I believe this is another testimony that the decision to choose a replacement for Judas was the right one.
>> Judas was counted as one of those. <<
He was until he died. After that, the bible still refers to the twelve, but the twelve now evidently includes Matthias, and not Judas:
“Then the twelve called the multitude of the disciples [unto them], and said, It is not reason that we should leave the word of God, and serve tables.” (Acts 6:2)