The dispute started when china encroches on mutual patrol points between both the countries in the LAC in ladakh. Patrol points are in no mans land. While china did not technically enter the Indian LAC maybe true(still there are de-escalation going on), it has also broken the lines of engagement by encroaching into these patrol points. Even after the clashes and escalation China has permanently built structure into the no man's land.

Why was there a push of hostilities during covid also the rethoric from CCP was agressive and manufacturing war like rethoric in its newspapers. Both countries people were dying in thousands and was this the time for China to do this?

There were 20 Indian soldiers who died, for what a 1km incursion into a point in No Mans land? What is China trying to get here? Other than try to bully?