If it was coming out there would be a doppler shift due to that motion.Thanks
As you say; they didn't find it.
So we all agree that there is no Doppler effect.
However you claim that:
So it's the stuff that's falling in.Sorry, that outcome is not realistic as in the same token I could claim that:
Because it's not coming out.
"So it's the stuff that's falling out, Because it's not coming in"
Therefore, as they don't see if it comes in or out then no one can claim that it is falling in or out.
So far you have failed to offer any real evidence (as Doppler shifts) for matter that clearly falls into the accretion disc!