occurs approximately every 210,000 blocks.
It occurs
exactly every 210,000 blocks not approximately.
As a result, the rate of new Bitcoin issuance decreases over time. The combination of the 21 million coin limit and the decreasing issuance rate due to halvings creates a scarcity effect, making Bitcoin increasingly difficult to mine and ultimately limiting its total supply.
Capped supply has nothing to do with mining difficulty at least not directly. The number of miners or more precisely hashrate is the only reason determining difficulty
"On addition of more coins to the already distributed 21 million coins will this change the halving graph of complex?, Will it alter the timing of halving in Bitcoin?"
No!
specifically every 210,000 blocks.
Did you copy this whole text from two different places that it has this contradiction inside?!
From the above I just got better understanding that even the man who invented Bitcoin has no monopolised power or single power to alter the trend of Bitcoin and halving period. It has to be consensus between many Bitcoin users .
Exactly and in fact this is one of the most important characteristics of Bitcoin that sets it apart from majority of altcoins.