The forum has rules.
While I don’t know the details (especially not the content of deleted messages), I can’t really judge this.
But the usual procedure is that people get warned and are banned for some time. After several bans, they may get banned for longe periods. The ban for live (forever is 1000 years in this forum software) is a bit harsh. I would prefer this to be reduced to something more reasonable.
On the end this is Xojo Inc.'s forum and they do the house keeping as well as the door man.