No, the claim is that a scientific proof is sufficient from him to feel the need to change his beliefs. It isn't that it's necessary.
Technically true, but nice though that is, saying that scientific proof would force you to change your beliefs still isn't a very impressive show of rationality. It would be better if he had said "Whenever science and Buddhism conflict, Buddhism should change".
I know, it is good to hear it from a religious figure, but if it were any other subject the same claim would leave you indifferent. "If it were scientifically proven that aliens don't exist I will have to change my belief in them." Sound impressive? No? Then the Dalai Lama shouldn't get any more praise just because it's about religion.
Here's the new thread for posting quotes, with the usual rules: