Don't know if what OP says is true or not, but I wouldn't be surprised either way. I haven't been on poloniex in quite a while and haven't been watching the price. That little IOU thing on Yobit has crashed like 94%--is it doing the same on poloniex? It's crazy the money movement in the altcoin world. Eth goes up, Lisk goes down, bitcoin stays flat, blah blah blah.
Funny story, I almost got myself into trouble playing with this today. Logged into yobit to compare ether prices vs polo, and noticed LISK had kicked the bucket. Ran to fucking ruin I mean. Switching tabs over to polo, I noticed the difference: .0001 to .0008. My hand involuntarily went to buy, but, remembering what exchange I was on, I had the piece of mind to ask in the trollbox if the Lisk wallet was cool/was withdrawable. Was immediately informed it was supposedly on the wrong chain, I didn't investigate further, took that as a no. Had I purchased, my friend.. no one would have heard this story tonight