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I wonder what ISP has customers in both Pakistan and Hungary...

An ISP that recently bought IPs formerly used in Pakistan and Hungary (or is in one country and bought the other block), and IP location data hasn't updated yet.

They also note that in some cases the notices were filled before anyone even looked at the videos.

They can look into more logs and check fingerprinting elements (screen resolution, browser, OS, time zone etc) and they'll very likely all match up. Timezone alone actually should be sufficient to convince most doubters.

They can tell just by the first byte of the IP address. CGNAT addresses start with 100.

uhm CGNAT can be any ipv4 address

edit: i realized you're talking about the internal private ip addresses which youtube cannot see... so still confused

More likely a VPN endpoint.