That's not what I said. I said the vet office I called said they don't see "flock chickens". Whatever that means. They would not see him because he is a part of a flock of which I would eat their eggs. I'm not making this up.
I'm not sure what to tell you... Not drinking, body score of 1, respiratory issue, these are very serious. Syringe feeding fluids is dangerous, so I recommend tubing them instead, but tubing requires one to be able to restrain their bird.
Email the video to the vet that saw him and see what he says.
If he were mine I would weigh him, tube fluids, and start Baytril.
-Kathy