NSE seems to have a separate order-book for SLs, which is different from the regular order-book, so presumably, unless NSE is being hacked into or there's some corruption going on, SLs are probably not visible to everyone until they're triggered & sent out as market or limit orders into the regular-book.
https://www.nseindia.com/products/content/equities/equities/trading_system.htm
The following video should be somewhat helpful in understanding that institutions just know how retail traders trade, which allows them to guess where most SLs are likely to be after a move, & then they wait for pullbacks/rallies to hit the area full of SLs & lap up all of that liquidity since it allows them to minimize slippage on their large orders. Of course, not all institutional traders might be trading exactly the same way but that's beside the point.
If you think stop-hunting is very profitable, then try it yourself & see how it goes!
https://www.nseindia.com/products/content/equities/equities/trading_system.htm
The following video should be somewhat helpful in understanding that institutions just know how retail traders trade, which allows them to guess where most SLs are likely to be after a move, & then they wait for pullbacks/rallies to hit the area full of SLs & lap up all of that liquidity since it allows them to minimize slippage on their large orders. Of course, not all institutional traders might be trading exactly the same way but that's beside the point.
If you think stop-hunting is very profitable, then try it yourself & see how it goes!