This is the tragedy. Iscariot might have been St Iscariot, but he did not repent. Rather, he died an impenitent suicide.
This is usually damnable.
Now - it is plausible that Judas may have repented ‘on the way down’, or he have had reduced free will (as e.g. some schizophrenics do) - but it seems very likely from our incomplete knowledge of the events that he is indeed damned.
Killing himself in despair is why he is damned - not because he betrayed Christ. After all, St Peter also betrayed Christ - as have a great many of us.
Judas was damned before his suicide. Jesus told him that it would have been better for him that he had never been born, and the reason was his future betrayal of Jesus.
Seems this is a ton of speculation without any facts..do you have any scripture to verify this ?