I saw that tip as well. Have no clue why. The following happens when you register:
- You’ll create an EOS private and public key.
- You’ll sign you EOS public address with your Ethereum private key.
That way you’ve proved to be the owner of a certain EOS and a certain Ethereum address. So whn EOS goes live you import your EOS private key and your tokens are there from the genesis block.
So I personally don’t worry about any other tokens being on the same address on Ethereum.