I was just comparing the two sites. I'm not saying Geo-Blocked sites should be banned on HN, As I said in another comment, I think the same rule that applies to paywalls should be applied to to sites that geoblock themselves (Not being geoblocked by a goverment which the BBC is in China).
If their are workaround for a paywalled site then its allowed on HN. So if their are workaround for the geoblocking (outline, google cache, archive.today, etc)then I think they should be allowed.
As for how you will know if a sit is blocked, the same way people find out about soft paywalls, the comments will tell you. Its not like a crime to post paywalled sites to HN.