Nah, if it was a vacuum energy state catastrophe it might be different, because the act of seeing it would mean it’s propagation front was upon us. As it stands, we’re looking at the activity of a black hole as it was 12.8 billion years ago.
Now, interestingly, the area where this was/is taking place could just be empty now, the hole having sucked up the surrounding area for thousands of light years.
Just what I was thinking. Maybe millions of light years. That would also mean it is much bigger now than what we are seeing. Forget stars, this thing may be sucking up galaxies.