The GP does not. They just describe how some people might (and absolutely do!) follow that train of thought.
They are describing their own view _and_ attributing their reasoning to others.
But the argument isn't valid.
So if you have liberal values and consider a hard takeoff a likely near-to-medium-term scenario, then it's perfectly reasonable to argue that you should prioritize alignment research over almost anything else, because it's a critical instrumental goal for achieving all your other goals. This by no means makes you any less of a liberal, or more of a conservative.
But people who are more interested in virtue signalling than results, and/or don't know about or believe in a hard takeoff scenario, may interpret this train of thought as "conservative" because it appears to not match the standard thought patterns that a good, card-carrying liberal is supposed to have.