Here's a thought for you, javelin atgm original range was 2.5km but now it achieves 4km+ range by just changing to better clu as old clu was not able to lock targets to that range. So, I don't see any problem that there could be a similiar 4km class mpatgm. Chinmoy even send you the report by Ajay Shukla, respectable source among journos. Even though it's my first time hearing about 4km range of mpatgm. Let it induct and we may know if a 4km+ variant exists.
Also there is Nag mk2 which is apparently manportable as less than 20kgs, so everything is confusing now or nag mk2 is mpatgm 4km variant.
Anyway a brochure by drdo showing 4km range from mpatgm would be assuring. I was waiting for this year defexpo juicy pics but yeah.....
For me I don't care if it's even 2.5km range, I just want that it's weight should be light and allow firing from shoulders without use of tripod