It's because the last time that we hit $99k, and almost everyone thought that we are going to hit that $100k but it didn't happened. But it seems that the the scenario is ripe for a $100k in the last 24 hours and that's why he posted it. And so he is right as we hit a new all time high at $103k.
Everyone cares as this is the first time that we will see this, so it's historic for Bitcoin enthusiast. Others might not be awake though to see it happen in real time. But fortunately, for he I still and so yeah, I was happy to see and check my portfolio immediately.