Fish do not.
Humans do.
How can you say that "fish do not [have the relevant genes]" if no lobe-fin has ever been sequenced?
To make a claim about fish in general you would, at the very least, have to check ray-fins, lobe-fins, hagfish, cartilage fish, bony fish, etc etc.
More importantly, he first needs to prove that coral respond to LPS like humans do. He seized onto one sentence in a popular news outlet story and extrapolated from there to the baseless conclusion that corals must respond to endotoxin in the same way as humans, and that fish do not. Since coral haven’t got TLR-4, this is pretty much impossible. Even if they did have TLR-4 it wouldn’t help him because fish have that as well as humans, again consistent with evolutionary theory.
Basically he’s thrashing about like a patient in electroconvulsive therapy where the nurse forgot to administer the paralytic agent. Ouch.
Because there's no DNA evidence of *any* fish having endotoxin recognition and signaling capabilities.
For that matter, there's no DNA evidence to support Evolutionists' repeated (and tired) claims that lobe-finned Fish are a key branch to mammals.
Such claims are pure supposition.