Earlier quoted context omitted.
Why is this an uncrossable line, though? Clearly this research is meant to be a first/early step towards preserving brains in the event of traumatic bodily injury. Is that not a worthwhile goal? Is it outweighed by some possible nefarious abuse of this technique? There are obviously major issues to work out still, but I don't see how else this research can advance but with animal experiments.
Because animal torture is considered unethical. If you don't agree that's fine. Let us at least agree the line is needed. We shouldn't be discussing this retroactively.
In this article there was no brain function at all.
As research progresses, it may be possible to establish brain activity without any pain sensation. One can debate whether being suddenly blind, deaf, and paralyzed rises to the level of animal abuse. And then, whether this is nonetheless worth the research benefits.