The thing for them is the very low infection rates. They need boosters every couple of months for making anti-bodies.Are you asking about the opinions of the public or the doctors and researchers who study long covid?
I don't remember having seen news regarding research on this subject in China. Probably because there are not many long covid patients in China. But I am not in the field so take what I just said with a grain of salt.
The public have heard of long covid from the news and stories in the west. Though it's hard to tell whether or not they were taking it seriously because the news and stories took place far away. Perhaps the current Omicron wave in China will change how some of them see long covid.