Interesting member list to exclude Korea, whose military is literally larger than the rest of the Pacific members combined.
Maybe because that alliance of actually relevant militaries already exists?
https://en.wikipedia.org/wiki/American%E2%80%93Japanese%E2%80%93Korean_trilateral_pact
Though maybe they would want to consider adding the Philippines, with their military twice the size of Australia's.
And, of course, Australia is already protected by ANZUS and AUKUS, if you consider America a trustworthy partner in the first place.
So the question about this opinion from a Biden official isn't really why is America not making Pacific treaties, it's why he doesn't know they already exist and why Australia isn't looking to create its own network that doesn't rely on America.