Oh no worries! For future reference the main standard we apply is "is post X substantively the same story as post Y". In this case I'd say the answer is clearly yes, in the sense that the discussion it led to was more or less interchangeable with the other thread. But it's not always obvious in advance!
Edit: turns out the mod who downweighted the original thread, when the two were on the front page at the same time, thought that this one added significant new information and so the discussion should move here. In other words they saw things the same way you did. It's a reasonable interpretation :)
More here:
https://hn.algolia.com/?dateRange=all&page=0&prefix=true&sor...
https://hn.algolia.com/?dateRange=all&page=0&prefix=false&so...
Edit: turns out the mod who downweighted the original thread, when the two were on the front page at the same time, thought that this one added significant new information and so the discussion should move here. In other words they saw things the same way you did. It's a reasonable interpretation :)