He can't appeal without it is my understanding here.
I believe he can appeal, the bond/escrow is to stay the judgement during appeal.
If he posts the bond/escrow and appeals that means the judgement is put on hold so no seizures can occur. However if he fails to post the bond/escrow, then the State of New York can start to work on seizing assets. While that process is proceeding, FPOTUS#45 and the Trump Organization can still appeal.
WW