How to remove the warning banner or message for Phriendly Phishing simulation emails in Google Workspace

How to remove below warning message in Google, flagging our simulation emails as potential phishing email?

Add a custom spam filter.

1. Log in to the Google Admin console as a super admin. 
2. Go to Menu  Apps>Google Workspace>Gmail>Spam, Phishing and Malware.

3. Navigate to Spam>Configure.

4. Add mail.phishingacademy.com to the address list

5. Click Save