Hmm very twisted logic. If BCH confirmations are the problem then BCH deposits should be limited not bitcoin withdraws. Limiting bitcoin withdrawals means this exchange is running fractional reserve on bitcoin! It is very dangerous to keep your bitcoins there!
they won't get the juicy fees for days.
i have 0.02 btc 'tied up' on there. i'm not totally convinced i'll get them but life will go on.