For me it returns the same result as Cloudflare, and they are using Maxmind

I think it's one of their paid versions[0] with a few addons[1][2].

[0] https://www.maxmind.com/en/geoip2-precision-city-service

[1] https://www.maxmind.com/en/geoip2-isp-database

[2] https://www.maxmind.com/en/geoip2-connection-type-database

For me it's more accurate (in the correct state) but still off by a lot (several towns over)