Well, for the sake of completeness, a critical aspect of the definition of Hell is that there's no getting out. Purgatory, by contrast, is NOT for ever. It's until you're cured or paid up or whatever metaphor one likes. So everyone in Purgatory is assured that they are going to Heaven. By definition, therefore, they are not already in Hell.
Side note: calling something "overwhelming" does not make it so.
And where is that written??? Is that another one of those heresies invented by Origen that he brought into the church from pagan religions? Do you believe it because the Catholic Magisterium says it is true? Where is the word for "Purgatory" in the Scriptures??? Heaven is there. Hell is there. But Purgatory is noticeably absent?