Comment on STT Trap - Options Expiry - NSE BSE MCX-SX
If you have sold the options, you have already paid the STT so you don’t have to worry about paying STT while buying your options back either on the exchange or when it expires in the money.
Whoever holds a buy option position which is expiring in the money has to pay the increased STT on expiry if he doesn’t sell it on the exchange.
You seem a little confused, do read the blog again.