Hi Sudhansu,
Apologies, no answers from my end, but maybe I can help understand your challenge better.
The page in question seems to be loading all the map information as tile images from a dedicated map server, similar to :
https://mapserver.org/It does not load up the data as vector shapefiles.
People who have to publish maps on website, tend to go the server way specifically to prevent users like us from scraping this data while still letting us see it.
If there's other stuff like WMS etc then I don't know about that. I can just confirm that the data isn't being loaded as shapefiles or vector data, hence not immediately scrape-able.
Also: I'm having trouble accessing the website today. Had seen it a couple of days ago.
Regards
Nikhil