No. The linking pop-up only appears on first login. If you skip it, it will not appear again. Please be careful when linking your account.
When you log in for the first time with a PSN account and see the pop-up, it means this PSN account has not yet been linked to any Gryphline account. If you skip the pop-up, a new Gryphline account is automatically created for that PSN account. After that, you cannot link it to an existing email through the User Center.