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This is fairly sensationalized, I think. "The researchers still need more data to confirm that these galaxies are as large, and date as far back in time, as they appear... 'Another possibility is that these things are a different kind of weird object, such as faint quasars'."

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"such as faint quasars, which would be just as interesting"

If you're going to quote, I would suggest to do it fully.

And quasars are, if I remember correctly, just galaxies whose central black holes are ingesting large amounts of gas. The accretion disks that form in orbit are simply massive and form giant light years long jets that shoot out from both poles. Active galactic nucleus.

Not all SMBHs have to be AGNs. We expect there to be primordial black holes of many different sizes prior to galaxy formation.

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