If any of India's and random media claims that US and Russian intel know PLA lost more than 20 men like India prefers to imagine and propagate, then why don't they challenge China or even just say officially that CCP is lying about losing 4 men?! They don't because they either don't know or they know that China is telling the truth and there is no need or purpose to challenge it officially.
In any way one considers this, India is lying because it won't even declare this itself officially and because not a single nation or independent group believes them or will back their claim because they know it is false. Otherwise the CCP would have been called out on it the moment it released not only how many PLA died but also some footage of clashes.
Why India doesn't declare anything officially only serves to show that they are afraid of being officially proven lying. CCP is waiting for India to make official statements about anything related to who the incident started (who did what when etc) and how many losses. India is only parroting one line "woo hoo disengagement!" but don't think about the details within the disengagement especially India losing access to claims, take a look at these entertaining things instead!