I don't think your instance has blocked mastodon.social, as there are still mastodon.social accounts visible via searching your instance (e.g. https://floss.social/@Gargron@mastodon.social).
I'm not sure what is happening with fediverse.info, the submission section seems to be missing now? Maybe @dansup can comment if he isn't busy? (He may well be busy though as he has created so many Fedi platforms!)