Bitcoin has a finite supply of 21 million and that means that it can not be manipulated like fiat currencies.
Manipulation exists in all market and all areas. Bitcoin market is not an exception and it can be manipulated as same as other markets.
It's limited supply means that no centralized authorities like CBN can mint more of it and cause a likelihood of inflation.
Bitcoin is Proof of Work in design and to get more bitcoins, there is work to mine new blocks and get bitcoin from block rewards. Until 2140 and 21 millions of bitcoin in total supply mined all by miners, with each new Bitcoin block, there will be new bitcoins appearance and added to circulating supply.
Bitcoin was structured from it's creation as a decentralized digital cash with a limited supply which makes it an hedge against inflation.
Bitcoin by its design, is inflationary too but its inflation rate is less than fiat currency and inflation rate is fixed by Satoshi Nakamoto code. No one can change it, that is different than fiat currencies with manipulated inflation rates by governments and central banks.