How does this "DNS trick" work? That to me is a much more interesting detail.
It likely overrides DNS resolution to CDN/POPs in countries which don't require age checking, or routes the traffic through TCP proxies so your traffic appears to come from a different country without these laws. This will increase the latency of all traffic to that site though.
I also can't find anything different in the returned A/AAAA records compared to my standard resolver.