Miners Total Stopped Selling Bitcoins, they simply not selling at this price.
https://ibb.co/kx66VKZWe going up

79k
What are you taking about here. We are not going up, we are not going down

79K...No Way, its 50K lolzz
There is always someone who will sell at the top and create the panic. People might be looking for the news and reason for the dump, the fact is some whales took the profit at 60K and bought back at 50k.
Perhaps the OP spoke to soon, the market in the last 12 hours went down hard to $52k-$54k because of some unconfirmed tweets. Nevertheless, it's not a perfect time for the miners to sell, probably they will get even with the recent turn of events.
So let's see start of next week, I have a feeling that this negative movement will be over as institutions are going to scope more bitcoins in the next couple of days.