IPv4 addresses are not permanent and shuffle around a fair amount. There aren't enough addresses to cover the number of devices on the net. You'd need an ISP to map an IP to a specific time range confidently. Governments could do that but they could also do that pre-leak if they were investigating someone.
Apparently some admins had their personal emaild registered, and I heard posts caught the IP of posters.
IPv4 addresses are not permanent and shuffle around a fair amount. There aren't enough addresses to cover the number of devices on the net. You'd need an ISP to map an IP to a specific time range confidently. Governments could do that but they could also do that pre-leak if they were investigating someone.