Sure, and frankly there is nothing preventing trump from appealing. However an appeal is not a green light to ignore or discard the lower court’s decision in the interim. Specifically outlined in the NY Court website
"Filing a Notice of Appeal does not stop or stay the winning side from taking steps to collect or enforce the judgment from the lower court. To put the collection on hold, you may have to ask the court for a stay. You may have to pay an amount of money equal to the judgment amount, called an undertaking, to the court while the appeal is being decided. "
And further to the point, I’d still like to understand what context he’s appealing under that was so compelling. This is a financial case, the facts and accounting figures supporting the judgement will presumably not change, leaving little room for a successful appeal.
Ultimately I’m of the opinion this is a frivolous appeal, and trump will not find the full amount owed at the end of it. By lowering the bond the appeals court has neutered the purpose of securing the bond in the first place, which can only to lead to more delays and difficulties collecting in the future.