BA have plenty of form on this I'm afraid.
Back in October 2011 I was interviewed, assessed and placed in a holding pool. Despite constant strong rumours about a complete freeze on recruitment, it wasn't until October 2012 that swimmers were informed that the pool was being closed.
I recall the same stories in 2008 or around that time. With Brexit and the general cyclical nature of the industry, I wouldn't be surprised if BA's growth ceases.
You cannot blame the recruitment team for the lack of information or clarity. I'm sure they're as frustrated as you are.