That fully depends on Poloniex. But I think there is a good chance that you will get them based on past performance.
However, it will be complicated, because I doubt they already kept the logs of how many ardor everybody should should receive. Best is always to transfer them to your own NXT account, although it may be a bit late for that now (and if Poloniex pays based on the amount held on 13 October, than you better have them in your account).
Yeah, it's a little bit late, given the fact, that NXT users will get Ardor tokens based on average amount of NXT in their accounts from July 14th to October 12th. I don't know if Poloniex is gonna implement the same calculation method, but I send a message to their support for clarification. As soon as I get the answer, I'll post it here