Well, they cite astronomers, researchers & a professor from Yale university. Are all these lacking complete information or the dynamics involved? If so, it’s a sad state of affairs. Of course, it could just be an idiot journalist, but I repeat myself.
My answer to your question is, imho, yes.
They are guessing about dynamic events happening 7.5 billion years ago and 7.5 billion X 6 trillion miles away.
The people you list are paid to do this work and, while I am sure they are dedicated and enjoy their work, exotic theories - iow, guessing - is the best we can expect in these circumstances. Wobbling starlight reception and variations in a color spectrum and so forth is scant criteria to base much of anything on, much less these events as they are contending - events separated by such fantastic time and distance.
I am still interested in how a massive black hole can be pushed around - ejected from a galaxy, they said - and by what force.