As far as I can tell, it's not in their diplomatic practice to brag or go out of their way to show off. This is more a Western thing and especially so for India. These studies are peer reviewed and inactivated COVID-19 vaccines are simply not being widely studied in the West. So, anytime a non-Western study breaks the confirmation bias that Western mRNA vaccines are "superior" to the "inferior" Chinese vaccines, you have dismissal of Chinese test data just like you have dismissal of anything else Chinese related that is positive. The important thing is, China doesn't need to worry as much because inactivated vaccines don't have the same issues as mRNA with inflammation, immune system exhaustion and other problems.