--snip--
Anyhow, he has never shared the methodology and the last time I checked, he preferred to keep it a secret so I can't really vouch or check for the accuracy.
Yeah, i also never recall he ever share detail of how methodology. Although IIRC the data gathered from his Bitcoin DNS Seed[1] where Bitcoin Core (along with it's fork) connect to DNS seed to get IP list of Bitcoin node.
[1]
https://github.com/bitcoin/bitcoin/blob/v25.0/src/kernel/chainparams.cpp#L135