Requests at https://en.wikipedia.org/wiki/Wikipedia_talk:Flow/Archive_11#Can_Wikipedia_talk:WikiProject_Breakfast_be_easily_switched_back.3F for proof that it is possible to convert Flow boards back to wikitext, should the desire or necessity arise in the future.
Make sure all content (description, summary, topics, posts) is exported. It does not support full attribution, so the Flow archive needs to be kept (possibly protected) for attribution.
After updating, do another sample export.