The article is a bit wrong. nofollow does not mean that the crawlers must not follow the link, but means that the ranking algorithms must not consider the link for the ranking as the link could be dubious or spam.
As such, the relationship between the page linked and the page linking is not to be affected by the link. And this is what makes the links not surfacing.
Basically, the current Twitter HTML says: We have no outbound links.
As such, the relationship between the page linked and the page linking is not to be affected by the link. And this is what makes the links not surfacing.
Basically, the current Twitter HTML says: We have no outbound links.