Greetings friend...

Token Burn is a process in which some of the cryptocurrencies are destroyed permanently and removed from the circulating supply of that token or coin.

This could be likened to companies buying back shares to increase control and improve the price of their shares. Like the examples, you have given the prices of these currencies did increase in percentages after the burning.

I believe the token burn process is based on the simple economic law of supply and demand, I.e. By reducing the supply would most like increase demand, thus, increasing the price of the coin.

Thank you for sharing with us. Good Luck