Thank you for your answer. Too bad that there is no switch for that…
Well, the migration (from phpBB3 to Discourse) is done, but I still want to dock Discourse to the WordPress website and I would love to have all the old blog posts into Discourse as well. So, yes, you can say so.
It’s too many blog posts to be happy to do this by hand. But too less to write an script. I also searched for a script, but did not stumble upon one. So I will end up doing this by hand I guess…