[gbrown]

No, it means what it says - the growth rate is too high for known mechanisms, so they’re looking for explanations. The mass in the universe isn’t the issue, it’s that there are limits on the growth rate of black holes which grow through accreting matter.

[hinkley]

The article opines that the accretion disk converts velocity of particles around the black hole into the jet, causing more matter to fall in.

[gbrown]

That misses the point - jets are one mechanism whereby the matter can lose some energy and fall in, but they occur due to the high energy of accreting matter, and their existance does not solve the problem of the growth rate of these things. We are able to detect and characterize this object in part thanks to the jets, but the problem of mass remains.