Perhaps due to his young age, the host was unclear if it was an actual bid or a joke.
"This child looks a bit familiar."
"Whose child is this? Is he here as a joke?"
"Seriously, he looks quite familiar. Why is he wearing sunglasses in the middle of the night?"
"Does he have money? Is he here as a prank? It's 23 million Euros. Is some little rascal pulling a prank?"
…
The host was a Frenchman and did not recognize Tong Hua, thus thinking that he was out to play a prank. "Little child, this is an auction. Do you know how much money 23 million Euros is? Don't kid around."
The underlying meaning was "if you don't have money, don't joke around. Tell your guardians to come."
Nowadays, even if kids paid for games, guardians could retrieve the money back too. There were too many little rascals around.
Tong Hua took off his sunglasses elegantly. Some of the people in the auction recognized him and could not help but yell. "Wow!"