the origin of the pandemic was made a central point of contention by trump. it appeared very important to him, based on his own language, that we identify china as the place where the virus first infected people, and for a while, as the place where authorities had failed to control its spread.
while i see downfalls in terms like "the india variant", they seem small because they generally do not have connotations of blame. by contrast "the chinus virus" term was entirely about blame (and also about deflection from the failure to manage the pandemic effectively).