A golem is unable to be given the Earth Blade spell. In the same vein, would/should they be ineligible for the High Magic ability as well?
They can't be given an Earth Blade because Earth Blade is in the Healing effect group, which golems are immune to. The High Magic ability is not a Healing effect, I would have no problem with it being used by an Earth formalist in a golem. I also don't see a real balance problem with it, as it's pretty much an edge case at this point.
After rereading High Magic, I think they are on the body as they disappear after resurrection. That makes me change my stance to: No you cannot use this in a golem as its part of the body.
That seems fair. But it does state that all high magic effects expire upon resurrection unless otherwise specified. Cloak and Bane just specifically state the effects are on the body.
I agree it is confusing.