Considering the original title is just the name of the railway, and I do not think “within budget” is editorializing, I think the commenter is being overly pedantic
I opened the article expecting to see news about the budget and how they stayed within it, since that SEEMS like the biggest surprising news in a project like this. How is that overly pedantic?
I understand your expectation. That said, I think it's ok to add detail in commentary when the article doesn't mention it explicitly. So continuing to go upon the point that the article didn't mention the budget makes you seem as pedantic.