Catalyst® Waterproof Case for New iPhone 6.5” (2019) - Stealth Black

Is the hard coated optical lens for the camera scratch resistant? Will this also work with tempered glass or does it need to be removed for use?

I recently got the lifeproof fre for iphone 11 pro max, it has a water effect and looks like screen is wet or oily, does this case have it as well?

Can the lanyard be removed or is it attached and unremovable?

Would i have to remove the film screen protector i had the apple store guy stick on my screen?