it is a very risky move, it is upto you if you really want to run with the risk of telling your private keys to another website in order to receive a few hundreds of dollars (if you have a big amount of bitcoins)
honestly, it is not worth it, i dont know why there are thousands of people desesperated about claiming those coins.
I think this coin is going nowhere - no question about that.
However: there is a major misunderstanding if you think that private key exposure is a risk. Simply move your BTC to a new adress and wait for that BTC-transaction to be confirmed. Thereafter your initial adress holds ony the forked coin(s). Then transfer those forked coins (in decending value order) to an exchange to sell. -> No risk to your BTC holding.
Entering private keys to a website to claim is, of course, rather stupid.