I was under the impression that this round of recruitment was largely to cater for Summer 2023 requirements.
I can’t comment on any other aspect as I’m out of the loop myself. The only other facts based on the vacancy blurb and application forms is that they have made it clear that candidates rated on the A320 will be given preference, and for those who applied to the LHR vacancy, there was an optional tick box to indicate willingness to consider a Gatwick offer if successful.
As usual with all things BA, plans can change from one week to the next.
Recruitment have an email address for queries but I would suggest it might take a while to get a reply. As a previous applicant, you should also be given priority in booking assessments. I’m not sure what order they are sending invitations to assessment out in though (if any).