That's great advice that doesn't really cover the core issue here: GCP with a business contract is trusted to not do this, yet they did it. Yes, you can prepare disaster recovery and business continuity procedures, they have a cost and it's not trivial. If you postpone this cost as a technical debt due to an assumption that Google should be trusted to have a business contract with and got burned by Google I do believe it's not the victim's fault.

Your comment sounds a lot more like victim blaming than just a sensible procedure to have in place as much as I agree with the need for BC/DR. BC/DR are not free, paying Google (as they've done) should've been enough for this case.