I agree with the above statements. Absolutely speaking, it is not possible to make a definitive judgment concerning one’s ultimate eternal fate - concerning Judas or any other soul - , whether it is Heaven, Purgatory, or Hell.
However, the Scriptures make some very stern statements concerning Judas and his fate.
“The Son of man indeed goeth, as it is written of him: but woe to that man by whom the Son of man shall be betrayed: it were better for him, if that man had not been born. And Judas that betrayed him, answering, said: Is it I, Rabbi? He saith to him: Thou hast said it.” - Matthew 26:24-25
The following statement in particular, is almost of a statement of curse, of malediction, or of doom, concerning Judas.
"While I was with them, I kept them in thy name. Those whom thou gavest me have I kept; and none of them is lost, but the son of perdition, that the scripture may be fulfilled." - John 17:12
The consensus opinion, is that the term son of perdition in this passage, refers to Judas. The question to be asked then, is as to why the Lord refers to the one who betrayed him, as the son of perdition. My understanding is simply that, the Deicide, which refers to Judas’ betrayal, is a malediction. From this understanding, one can infer that Judas by his Sin, forfeited his soul, and lost his salvation.
Whether this position be argued against, yes indeed, it can. But there is enough evidence in Holy Scripture in order to state that position as defensible and probable.