Warning message from Console on the Spfx WebPart

I was little confused to see the warning message from console on the Spfx Webpart, which i saw from the below link it is not to worry. I have set the https to true in serve.json and gulp trust

https://techcommunity.microsoft.com/t5/sharepoint-developer/warning-message-in-console-when-spfx-webpart-is-added-on-a-page/m-p/173497#M4622

But i was wondering why it was reference to the below CDN, i have enabled the office 365 CDN. So when i select Hero WebPart stock images. Images reference from the below link.

Thank you in advance !!!