Not exactly - in this case, a person on Twitter found a two-year-old article showing that this particular judge was corrupt in copyright monopoly cases. There is nothing denoting how "official" the conclusion is, not inherently in the expression.
In a blog context, it means neither.
Good job on finding the other common meaning; you'll have noticed that a search on "found to be corrupt" yields two meanings besides this article: corrupted data, and findings of a court or investigation.
There are a lot of ways to phrase the headline that wouldn't make a reasonable reader assume that this was an official ruling, e.g. "X is corrupt", "Why X is corrupt", "Evidence that X is corrupt", "X alleged to be corrupt", or really anything but "found to be".
The facts by themselves are interesting, but the headline I found misleading.
It means that evidence indicating corruption has been found. Any other reading puts words in their mouth.