That's very odd. I'd try calling them... There are quite a few folks blocking proxies these days. What I do is remove the via and forwarded for headers with the following command:
check_hostnames off
forwarded_for delete
via off
The same configuration in an earlier version of squid doesn;t get rejected by Google but in the new version of squid it is rejected by Google so is it possible squid is doing something differently?

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