In your short video that is 3 minutes long. The Set up Billing Alets it doesn’t separate My trial biling account. It gives me a choice of either Admin Project or My Very First Project. It seems that Google Platform updated since you last made your video.
Are you sure there is an "OR" choice? As in, you can only select 1 or the other. I’m having no issues selected all checkboxes.
Yes interface has changed, we just need to select All Projects.