Yeah, that Panda is a leftover from better times when China gave them as diplomatic gifts. Its the offspring of 2 Pandas that were originally given to mexico before the 1980's when China stopped gifting and started the lending thing.
There are 2 more, that are not considered a loan, in Taiwan. But they are more a "F*ck your independence, you belong to us anyways"-gifts with the Chinese arguing that it was an inner country transfer and not a gesture to a foreign nation.
Nevertheless, all Pandas outside of China have been political pawns for the Chinese government including Xin Xin in Mexico.
It might have been on loan, but described as a gift as there's limited numbers they loan out.
Part of the reasoning for the loan system is that there's a limited number, and the terms of the loan allows China to take them back in the event the zoo fails to care for them appropriately, which happens with depressing regularity.