Dentist here, in terms of replacing root canals.
The technique described in the paper would not replace the nerves and blood vessels in the root canal system.
It just shows a new method for sealing off the root canal system - via a blood clot.
Unfortunately you would still need to have the root canal treatment - just the sealing may be slightly quicker with this method.
The quality obturation (apical seal) doesn’t really effect the clinical outcome o of root canal so unlikely will mean better outcomes either.
Seems like a lot of skepticism from the non-experts, coming from a perspective of confusing promising research with new products on the horizon.