network of the Bitcoin will see all the details in the Bitcoin transaction that how much they mined and how much they needed to mine more .
Everything is public and why would anyone have to analyze the detail once again before halving,do you think it is a custom thing done by the core developers or someone else 
On looking at the charts during halving the price always move higher because of the illusion that there will be only less currency being floated in the market and the halving in 2020 wont be the last halving either.