Well your first link to the Age is really a comment on Australian Media Headline writers who as usual write headlines not being su[pported by what's in the article. the head of the WHO said he understands why some countries have imposed testing on travelers from China not that there is any scientific reason for it.
As to your second article there are many more experts in vaccination and immunity tyhat don't believe there is a scientific reason for testing.
The real reason for imposing testing has been indirectly hinted at by the EU who have reversed their policy on testing in the last 24 hours.
Bloc recommends negative coronavirus tests from all arrivals despite warnings from Beijing of retaliation
www.theguardian.com
The decision as it has been around the world is political.
And here is an English expert commenting on the UKs decision to impose testing.
"I’d like to close by quoting Professor Andrew Pollard, chairman of the UK joint committee on vaccination and immunisation, speaking to BBC Radio 4:"
And it has been shown that NZ experts were in conference with our CMO and they were in agreement that the science didn't justify the imposing of testing on China.
New Zealand health officials reportedly agreed with Australian counterparts that introducing mandatory Covid-19 testing for travellers from China was an overreaction.
www.rnz.co.nz
And the NZ Government to their credit has taken that advice on board.
Health experts are backing the government's decision not to impose pre-departure Covid-19 testing on travellers from China - saying it would be a case of "xenophobia".
www.rnz.co.nz