There's a log of bogus assumptions in these articles, and he got caught because she was investigated, not him.
If he used a gmail account and used a separate device such as a private smart phone or tablet to access that account there would have been zero vulnerability, other than the fact that he could have been blackmailed. Gmail is pretty hard to hack into, the IP address of the device probably wouldn't tell anyone anything about where he is, since it's a private IP on the telco (can you tell a person's location from the IP on the telco?), and there wouldn't be any way to get to any of his secure accounts or make a mistake of using the wrong email account.
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There's a log of bogus assumptions in these articles, and he got caught because she was investigated, not him.
If he used a gmail account and used a separate device such as a private smart phone or tablet to access that account there would have been zero vulnerability, other than the fact that he could have been blackmailed. Gmail is pretty hard to hack into, the IP address of the device probably wouldn't tell anyone anything about where he is, since it's a private IP on the telco (can you tell a person's location from the IP on the telco?), and there wouldn't be any way to get to any of his secure accounts or make a mistake of using the wrong email account.
Telco's log everything! So it would not have been difficult, if you could connect the phone number to him, to track everything else.