Correct me if I'm wrong, my read is that this is a competitor to Google's external BeyondCorp solution[0]? (They reference the BeyondCorp papers in the post.)
ZeroTrust (BeyondCorp) is one component of SASE. For a while marketing departments were throwing ZeroTrust on everything, but eventually a new buzzword arose to better differentiate that component from the bundle of the whole kitchen sink. https://www.sdxcentral.com/security/sase/definitions/what-is...
0: https://blog.cloudflare.com/introducing-cloudflare-access/