Hui, who also urged support for businessman Jimmy Lai now being tried on national security charges, received asylum on Friday, more than four years after leaving Hong Kong, which has offered a bounty for him on criminal charges over the protests.
"It is recognition by the Australian government that human rights infringements and erosion of democracy and freedom actually happened and justified granting asylum to people like me ... being persecuted because of the protests," Hui said.
"I believe this is good for Australia to have that recognition and I am grateful for the country, which has given me so much," he told Reuters in an interview.
China's foreign ministry on Monday said Hui was an "anti-China rioter wanted by the Hong Kong police" and urged other countries to "stop interfering in Hong Kong affairs".
Australian visa data reviewed by Reuters showed it had approved no asylum claims by citizens of the Asian financial hub since January 2021, and rejected five in 2023.
Hui, who is working as a lawyer in South Australia, said the good news for his family came in a week during which he was concerned over Hong Kong's trial of his friend, the pro-democracy businessman Lai, on national security charges.
"Jimmy Lai is very iconic of Hong Kong's resistance because he actually had the ability to leave Hong Kong but he decided to stay," he said. "That is very noble of him."
Before his arrest, Lai had described himself to Hui as being "like a captain of a ship" in support of democratic values and would "sink with the ship".
Lai, 77, received medication and a heart monitor for the start of the trial's final submissions, prompted by health concerns aroused by heart palpitations.
Australia's Foreign Minister Penny Wong raised concerns with her Chinese counterpart Wang Yi in a meeting in July about anonymous letters circulated in South Australia offering rewards for information about Hui and his family.
The Australian Federal Police were investigating the matter, Hui said. A police spokesman declined to comment.
After Hui and his family arrived in 2021, 123 Hong Kong citizens have made asylum claims in Australia. Many more have taken up skilled visas under a program launched in 2021 for Hong Kong citizens to stay permanently, data shows.
The home affairs department did not immediately respond to a request for comment.
In a statement, the government of Hong Kong, a former British colony, said it was "against the harbouring of criminals in any form by any country".
Chinese foreign ministry spokesperson Mao Ning told reporters Beijing hoped Australia would work with China to ensure "sustained bilateral relations" when asked about the case at a regular press conference on Monday.
