Ah, I think I see what happened:

If a Tweet has a URL that gives a 404 or otherwise is invalid, I don't think Twitter returns that Tweet in a search for that URL. If the URL later became valid, the link for the Tweet would then work, but as far as search goes, that Tweet didn't have that link. At least that's what I'm remembering from some other previous experience. Who knows.

My point remains. ... at this moment, searching for that blog post URL (or the title of the blog post instead) will yield the Tweet from the SN feed, and not anything from the source, @voltage_cloud.