Yeah, this is where the recent changes to BA Club bonuses are a total mess. I hope this works in your favour. AFAIK, there's no direct mapping from cabin prime and subclasses to these definitions of flexible, non-flexible etc. Though if you use the BA Tier Points calculator, it does group JCD together into "business flexible." - note it doesn't differentiate between semi and fully flexible in this table. If there's any shilly shallying, I'd say you have a case in your favour. Though I would also be screenshotting stuff. How unlike BA to make a change like this without thinking through how to transparently explain it to customers.