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U-Olga does have some kind of absorption ability, however Sion clearly said Excalibur responds to Threat to Humanity but for some reason U-Olga doesn't register as Threat to Humanity hence the output is weaker than the expected. Also if U-Olga is not a Threat to Humanity then the Counterforce won't send a single Grand Servant let alone all of them.
In Olympus U-Olga Beast number is stated as VII but for some reason she didn't have it on LB7, there's also her skill called Protector of Human Order.
If spoilers I read were correct, U-Olga was actually summoned by the Counterforce in LB7.