It is a CDN, but what's new is that the openconnect appliances are distributed not just in datacenters, but directly to ISPs. Traditional CDNs aren't in your ISP.
Do Akamai has Servers right in ISP's DC / Network? I know they are within 1 hoops in lots of places, but never heard they are actually inside ISP's network, which is what Netflix OpenAppliance and Google Edge Node has done.
Netflix got the idea from Akamai. They are in your ISP for sure.