Ask HN: Friends Google account hacked, what can he do?

My friend has had a rough year (stressful completion to PhD, poor job market, immigration struggles with wife). To top it off, his Google account was just hacked in what seems to be a targeted attack after losing his US number.

All passwords changed, completely lost access and cannot gain any access back to the accounts. All phone number/recovery options changes en masse. Lifetime of photos, etc. have been lost and he is really bummed.

Given that a lot of technies and Googlers exist on this platform, would someone be able to point me in the right direction to help him out? Is he completely out of luck? All the changes happened in a sequence.

Time of hack: - December 12th GMT+1, 2025