It's very frustrating. It reminds me of when I applied for a V&E winter and was told "We will respond to your application by the end of October if not before". Literally nothing ever since, even after submitting supplementary information. It's like they're stringing you along by keeping you on their roster, or something. I never bothered following up, since I decided I'll just find something else to do 🤣
I wouldn't email again, as I don't think there's any more information to get out of them, now they've confirmed you're being considered for spring/summer. I'd follow the timelines of those who initially applied for those schemes to gauge your chances! In the meantime, try to not dwell on it too much. Or, if it makes you feel better, imagine HR as this gif: