USB-C cable for MacBook Pro 2019 16" - fully supported charging cables?
A USB-C cable is a USB-C cable.  Period.  Full stop.

It’s not going to be different for each different device.  The marketing  material that you’re seeing is for SEO or search engine optimization.  There’s no compatibility differences.

The USB-C port on your MacBook Pro 16” isn’t any different from the USB-C ports on any of those Mac laptops in the “specification page.”   Any cable with the the USB-C logo on it must support 10Gb/s transfer rate and support up to 100 watts of power.  Since the highest capacity charger Apple makes is 96W, any USB-C cable will work.

This is why you buy from reputable brands like Anker.  In order to put the USB logo on their products, they must pay the licensing fee and have the product tested that it meets the standards.  Yes, they cost more, but you can be assured they meet all the specifications.

Are there USB-C charge only cables or cables that don’t support alternate mode video or some other USB standard?  Yes, there are.  None will be USB “certified.”