Where do these suggested contacts "from my adress book" come from?
First off, this almost certainly is nothing to do with your new Google account.

The Twitter app has access to all the accounts on your phone with which it can suggest contacts. This means it probably looked at one or both of your personal IMAP accounts and used those to suggest contacts to you, rather than you 'empty' Google account.

The question you linked to is probably correct although instead of your Google email address the suggested contacts probably have one of your personal email accounts in their address book.