Though as for that the passing there / Had worn them really about the same
The poem is saying two things:
1. The line you quoted: Even though one of the paths looks special, in fact both are well-trodden paths. The walker is making a decision on imaginary evidence. The poem is mocking the poor decision-making process and retroactive rationalization.
2. (granted, not in the text, but in the context). The poem is about Frost's friend Thomas having trouble deciding deciding whether to volunteer to fight in WWI. Thomas died in the war.
"The road [supposedly] not taken" did make all the difference, but in a negative way. The walker should have used the rigorous method the article proposes.
http://www.historybyzim.com/2014/08/robert-frosts-the-road-n...
>The walker should have used the rigorous method the article proposes.
Curious how you'd justify this statement with the text.