Anyway now in SCAQ Telegram chat. Someone asked this:
Hi, may I know if there are any updates on potential ACCAxISCA mra for mutual membership.

ISCA scaq team replied:
Hi xxxx, we are working with ACCA to explore more pathways for ACCA members towards CA (Singapore) membership. Meanwhile, ACCA members can become ISCA Associate members too. Keep a look out for our announcement within the next few months.

So yea, I guess ISCA gonna screw the pre-2020 batches further. Just a matter of abit more time.