Where does that headline phrasing come from? The study does not, and does not claim to, pinpoint anything for autism.
They use mice bred for hypersensitivity, and look at which parts of those mice's brains can be suppressed to reduce measured sensitivity to heated floors and electric shock.
They use "mice models of autism" to get an indication of where to maybe start looking on the slim chance it turns out to be similar in humans.
The mouse model may turn out to be a different kind of hypersensitivity altogether. Human brains may wire hypersensitivity very differently. The observed results may be that the mice's reactions are different instead of weaker. Etc...
It is valid science, but a long shot away from a long shot at being applicable for autism in humans.