Mary had a genuine communication, or communications, form Our Lady, or she didn't. Bp. X has confirmed that she did, apparently, although he may have wavered in the past. Whatever the present ulterior motives of the two may be in fine, subtle shades of gray, I'll leave to chat forum experts like yourself.
Obviously, on the objective level, you are quite correct. Either she had a genuine vision or she did not. I am in the camp of having adopted the default position of Catholics, which is that of skepticism. Unless I see evidence or proof to the contrary, something which would overcome that default stance, then I remain in the default stance. In other words, the burden of proof is on the visionary and on Bishop Williamson. What I was addressing was the fact that OTHERS are making this about motivations. So, for instance, even if we can rightly conclude that the visions are false, we cannot know where in the spectrum of falsehood it lies, from the one end of outright fabrication to the other of being convinced that she was indeed receiving a vision but it was her mind playing tricks on her, or anywhere in between; only God knows the truth really.