It wasn't, as I said above his client won't be able to connect to the netowrk as there were a lot of changes to the network at 8.8.0 making wallets before then incompatible (afaik).

The address he posted can be checked here: https://www.blockchain.com/btc/address/18XvrmGDb7UbKeFkPSSbSH7UxZ7msZu66b

---

If you can wait out the sync, you might be better off doing it that way but if you do go with electrum (or any other wallet), search on how to verify signatures.

Private keys begin with a 5, K or L in the format we use now, it might be the same back then (5 type I think was started with). Don't put these keys online and try not to keep your computer online while you put them into the electrum wallet if you can help it until you've set up a password for the wallet.