The current version doesn't but there's not really a reason to believe it can't be updated. I think the author overstates the complexity of documenting these proxies and URLs for sites that run them.
History is full of sentiments like that, from power structures that were never able to stop subversion. The game itself is perpetual, so there's always another turn coming.
On the other hand, I wonder if you could just block all IP addresses associated with google, or those associated with their cloud/app engine? I suppose that could be handled at the firewall maybe? Are there ASNs google uses specifically for their app engine and cloud computing resources? Others have mentioned that a lot of government agencies rely on google app engine, but it’d be nice to kill all traffic to/from anything google.