He had removed the barrier, yes. He had taken the "Do Not Disturb" sign off his profile. But Tinder’s algorithm didn't care about his timeline. It operated on location, recency, and activity. Just because he had unblocked her didn't mean she would appear in his stack immediately. She might be on the other side of the city, or she might have swiped left on him weeks ago before he ever blocked her.
You can swipe, but your profile is invisible to others. This can last for weeks and is rarely confirmed by Tinder. how to unblock on tinder