Why am I seeing SSL events resolve to OpenDNS IPs?

This organization I’m working for uses OpenDNS/Cisco Umbrella. I’m confused as to why I’m seeing requests for SSL traffic resolved to 

Are these sinkholed IP addresses? I thought the blockpage IPs were these ones: https://support.opendns.com/hc/en-us/articles/227986927-What-are-the-Cisco-Umbrella-Block-Page-IP-Addresses-

I guess I’m just confused as to how this whole thing works. I’ve tried reading the OpenDNS support but it hasn’t really answered my questions on the IPs above.

How to Configure Google DNS or OpenDNS with Netplan?

I’ve tried setting up OpenDNS with netplan via the following two methods. And they don’t work. I know because I issue the command sudo netplan try and I get an error.

method 1

sudo vi /etc/netplan/50-cloud-init.yaml # Put this in the body nameservers:      addresses: [,] # Save, exit, then `sudo netplan try` 

…or this. Note that my internet is WiFi, not ethernet, not sure if that’s the issue with my syntax.

method 2

sudo vi /etc/netplan/50-cloud-init.yaml # Put this in the body network:   ethernet:     wlo1:       nameservers:         addresses: [,] # Save, exit, then `sudo netplan try` 

How do I setup OpenDNS with netplan? I know my link right here explains it, but that’s for older Ubuntu and doesn’t work anymore. I can’t even open Network Connections on Ubuntu 18.04. I think Network Connections GUI is deprecated.