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I always hate when scientists don't have an open mind to the fact that we don't know all the truths to the universe. Everything in his statement is biased to human culture and grasp of science. I think an important part of researching phenomenon like this is to think outside standard conventions.
That's also my concern. I question the basis of his reasoning, especially his use of terms like "rockets" and "money". He's viewing the situation through a very human lens, which is understandable. However, this results in a very "this is unlikely because I haven't seen it before" approach to reasoning.
Scientists do have an open mind. However it is only open to things that don't contradict existing experimental results. Relativity stands up well to experiments, so anything that replaces it will still be very similar.
And how does a “really powerful rocket” counteract experimental results?
All you need for interstellar travel without breakthroughs in physics is the ability to sustain a self contained ecosystem in your craft.
Humanity already has plans to send probes to Alpha Centauri, and the only technological price of that puzzle that’s missing is thinner solar sail material.
That is a close system. The universe is big. Odds are no alien lives close enough for solar sails to get here in the lifetime of the universe or galaxy.