This is trivial for Microsoft to bypass. They've already been consolidating and moving server addresses. Unless you block all internet traffic, you have no idea what's getting through. They can update the opaque code at any time. This is not a solution.
Blockers are going to have to switch to whitelisted IP addresses instead, I bet.
Annoying!
Btw, I do this and sometimes stuff stops working suddenly when you block random telemetry. This applies to MS and Apple products.