Why is hashtag 'Ancient Pakistan' trending?

An aerial, reconstructed view of Taxila (Takshashila) University, which existed in ancient #Pakistan 2700 years ago near today's #Islamabad. Over 10,500 students from 16 countries studied 64 different disciplines of higher studies taught by scholars like Panini.
@hannan021 pic.twitter.com/xRC5mdkb6g

Qamar Abbas Khokhar (@mqakhokhar) December 13, 2020

Needless to say, Khokhar was the victim of some of the choicest trolling. "Your history begins in 1947. There is no ancient Pakistan," said a user while another said, "What is this Ancient Pakistan? Lal Krishna Advani Ji is older than the existence of Pakistan."

But Khokhar is not the one to give up easy. He shared two videos of 'ancient Pakistan' that shows how the region was the bed of civilisation. "Dear neighbours! Here are some more details about ancient Pakistan," he said.

Dear neighbours! Here are some more details about ancient #Pakistan . pic.twitter.com/83mXsgVcre

Qamar Abbas Khokhar (@mqakhokhar) December 13, 2020

"Both Panini, the first linguist in the world, and Chanakya Kautaliya, the world famous political philosopher, were sons of the soil of ancient Pakistan," he claimed.

It is unclear if his follow up tweets clarified anything or only enthused netizens to correct him further.

This is called re-writing of #history. #Invention of ancient Pakistan to claim historic Taxila #University as part of Pakistani civilisation !

Who had even heard of #Pakistan 2700 years ago ? I am equally dismayed at the thought of great scholar Panini being called a Pakistani ! https://t.co/iByu9LPRxc

SP Shukla (@Prakashukla) December 14, 2020

There was no ancient Pakistan. There was no Pakistan before Aug 14-15, 1947, let alone 2,700 years ago. Panini & Chanakya taught at Takshashila university. Chanakya mentored Chandragupta Maurya whose empire was spread across the Indian sub continent, capital at Patliputra (Patna) https://t.co/U3DwSGZNIJ

shrikant malviya (@ShriMalviyaIN) December 14, 2020

Advani is older than ancient Pakistan https://t.co/Jm2JhL3wmc

Nemo (@nirmalyadutta23) December 14, 2020

Every history u cited is correct except for the part that it was part of Ancient Pakistan. There was no Pakistan and no Pakistani history.
Give of one quote of Chanakya or Panini where they mentioned the word Pakistan.
Bharat or Bharatvarsha is mentioned multiple times https://t.co/v4SJuLFJqU

Sanatan Bharat (@SanataniBharat) December 14, 2020

Ancient Pakistan? Do you mean ancient India?. Sharad Pawarji is more ancient then Ancient Pakistan or for that matter Advaniji too..

Abhishek (@abhishekgite) December 14, 2020

Searched for 'Ancient Pakistan'...found this! pic.twitter.com/iecKyCuvpN

iamVY (@iamVY5) December 14, 2020

after watching the trend Ancient Pakistan pic.twitter.com/46MgIv2WTf

ur._Felicia (@TechieDr) December 14, 2020