I don’t know whether it is or is not. And of course that would depend on where you are in India.
The climate of e.g. Rajasthan is rather different to that of Himachal Pradesh, or West Bengal, or Kerala 😉
For what it is worth, I have never seen any remark/complaint on FPN by someone in e.g. Spain, or southern France, or Arizona, or California (or India) to say that the grip-section of their Parker 45 has deformed/melted in their home.
My remark about heat possibly being responsible for deforming the grip-sections was a sort of ‘educated guess’.
Even if it is right, I would expect that the heat would need to be over 50 degrees Centigrade, perhaps over the mid-50s Centigrade, for it to cause any shrinkage.
So, if you happen to live in Rajasthan, I would definitely advise you to never leave the pen inside a closed car during the Summer.
But, if you happen to live in Shimla, I would expect that would probably never have such a problem. Unless you leave your pen on top of a heater during the Winter 😉
The best way for you to check whether or not the heat in your area might cause the plastic to deform would be to go on to your local social media, and ask if anyone who lives in your area has ever had a pen (of whatever model) melt/deform because of the heat.
Or, if you live in the Himalayas, whether anyone nearby has ever had a pen become very brittle in the cold during the Winter.