I do wonder if Justin and Roy knows this.

I do not know. However, I do have it on good authority they got an enormous discount relative to the value of the stake, not to mention the other company assets.

So either they knew some reasons for that enormous discount (most likely the history and community encumbrances on the stake), or if they thought they were buying simple stake free and clear (again, plus all the other assets), they were getting a deal that was "too good to be true" and still should have been very suspicious IMO.