Paris 2024 sold a record 12 million tickets for the Olympics and Paralympics, beating the Games record previously set by London 2012, organisers said on Sunday.
Palfrey's comments triggered a fierce reaction from team officials and the Australian Olympic Committee.
Lin clinched gold in the women's boxing final match on Sunday, an emotional win that came as she and Algerian boxer Imane Khelif have been embroiled in a major row over their gender eligibility.
Tennis was introduced to China in the 1860s, but it failed to gain mass appeal and was largely an elite sport reserved for the wealthiest families.
The Australian Olympic Committee has decried a "misleading and bullying" online petition that described Gunn's performance as "unethical" and questioned how she was chosen for Paris.
Indian wrestler Vinesh Phogat on Thursday lost her appeal to the Court of Arbitration for Sport (CAS) after her disqualification from the women's 50kg final at the Paris Olympics for being overweight.
The athletes, fresh from a national record 53 Olympic medal trawl, were asked about absent colleague b-girl Rachael "Raygun" Gunn.
Australia's Olympic team, including gold medallists Jessica Fox, Kaylee McKeown and Ariarne Titmus, arrived back in Sydney on Wednesday to a rapturous welcome from friends, family and Prime Minister Anthony Albanese.
World champion Noah Lyles roared to victory in 9.79sec to claim gold in a dramatic men's Olympic 100m final in Paris on Sunday.
Novak Djokovic described his Olympic gold medal triumph on Sunday as "probably" his "biggest sporting success" and revealed he may defend the title at the 2028 Los Angeles Games when he will be 41.
The United States' 64-year unbeaten run in the men's 4x100 metres medley ended at the Paris Olympics on Sunday as China swept to a seismic win at La Defense Arena.
The United States set a new world record as they powered to gold in the women's 4x100m medley relay on Sunday with Australia taking silver and China bronze.
With her second win of the tournament, the 28-year-old Lin is certain to win a medal because losing semi-finalists in the boxing take home bronze.
After heartbreak in Beijing, London, Rio de Janeiro and Tokyo, Djokovic simply would not be denied the one title that had eluded him for so long, winning 7-6(3) 7-6(2) in front of an enthralled crowd on Court Philippe Chatrier.
Algerian teenager Kaylia Nemour conjured up "the performance of her life" to become the first African to win an Olympic gymnastics medal with gold on the uneven bars on Sunday.
"This is a singular moment in history for Saint Lucia that we will remember for the rest of our lives. I'm so, so proud about everything she has accomplished so far."
All training was cancelled in the river last week and the men's individual race had to be delayed by 24 hours because of pollution problems.
South Sudan coach Royal Ivey was highly critical of the officiating as his side's Olympic basketball dreams came to an end as they failed to qualify for the men's quarter-finals in a heartbreaking loss to Serbia.