No. The flag was "deferred" so the post will forever have the "off-topic" flag attached to it. Good news is that only the flagger and moderators should be able to see it. (The post keeps getting hidden though. Not sure if it's because of you messing with the flag or if some automated thing in Discourse is doing it.)
However, even if not in that thread, the post was still not off-topic, as generally nothing is off-topic in #uncategorized.