When asked if he had received his paycheck in Bitcoin already, and was told that the price of Bitcoin has come down, he simply laughed it off saying, "Well, you know what, sometimes the best time to buy is when things come down so when you go back up you've made a good profit..."[2]
One thing you might have missed.

He is in office since January 1, 2022, he hasn't yet received any check bitcoin, so he isn't affected at all by the drop, he hasn't got any money at stake to date.
So of course it's easy to laugh it off, who wouldn't?