Is the steemph.cebu account really a communal account? If it's only decided by a few people instead of a community, wouldn't that not behave like a communal account?

As for the powering down, it depends on how much shares will you take from the powerdown. No matter the amount, it should be equally distributed to the people that delegated to the account because their SP contributed to how much curation rewards the account got by proportion to their delegated SP. So even in powering down, people will have a say on the rewards.

Then again, none of the conditions had any policies in place when the time to power down comes that the community had agreed upon. So even delegators on this case, have no say on how much shares they are owed. Why? no contract/agreement.

It's douchebaggery to take those rewards powered down without proportionally distributing them back to the delegators. To claim ownership on a communal account would be public betrayal, after all, it was advertised as a communal account. No single stakeholder owns it, and the people that control it have the privilege acknowledged by the public. Before powering down, you have the obligation to notify your stakeholders. That's where it went down hill.