It speaks to what the implant has achieved. Going from barely walking in his own words to walking 6KM is a solid and easily relatable improvement (it is a news article).
You might say that your car could now drive 20 miles if before it was known that it barely made it to the end of the road.
Good point, and I do think it was important context to have in the article. I think having the specific number of kilometers in the headline was what really threw me off.
You might say that your car could now drive 20 miles if before it was known that it barely made it to the end of the road.