No, you found several sites that say the exact same thing, and you left out what Gehenna is, and you cherry picked the part that suits you like you always do.<quoted text>
Maybe your version doesn't but I found several sites that say they do.
When the ancient rabbis talk about Gehenna, the question they are trying to answer is "How will bad people be dealt with in the afterlife?" Accordingly, they saw Gehenna as a place of punishment for those who lead an immoral life. However, the time a person's soul could spend in Gehenna was limited to twelve months and the rabbis maintained that even at the very Gates of Gehenna a person could repent and avoid punishment (Erubin 19a). After being punished in Gehenna a soul was considered pure enough to enter Gan Eden (see below). You can learn more about Gehenna in: "What Is Gehenna?