If that was a manipulation then a drop from 99 to 95 k was a manipulation as well
It's not about a certain price. It's about what's going on in the world. For instance when bitcoin dropped when the US shut down during covid, it wasn't a manipulation but panic. An example of manipulation was when in 2013 Mt. Gox used a bot to pump the price, which later caused bitcoin to drop from over $1k to $200.
The move to $100k was not a manipulation. The fact that we were at 98-99k for so long was because people were setting up sell walls at $100k so that the price would not go there.
Is the price manipulated? Of course because there are those who don't want it to reach a certain level. Not everybody wants bitcoin to succeed.
Who might be these people? The most obvious answer is that those are people who run businesses that might earn less money due to bitcoin taking away some of their market, for instance credit card companies, banks (those who do not allow their clients to send money to bitcoin exchanges), companies that offer paper gold.