Lols you cannot fool the blockchain by getting an old BTC Wallet with private keys to get some BCH. Hehe. If you want BCH you should have a BTC balance from your wallet.
But it's true that there have been forks where an old BTC wallet can net you some free coins. I remember a couple years ago, there were a bunch of people on the forum buying old addresses. There was a website where you could check CLAM balances of old addresses you controlled, and people were bidding on them (either to dump because people were willing to sell them cheap, or to hold speculatively).
I never paid much attention at the time; I probably should have. I bet I could have gotten some free bitcoins out of it.....