A strategic reserve! They directly or indirectly hold the largest reseve of Bitcoin by a nation. They as in the government has been pumping the price of Bitcoin. It is evident on how Bitcoin created new ATH after Trump was declared as the next 47th President of the country.
Are you talking about seized coins? That is not the same as reserve though.
As for the ATH, it is just market manipulation during certain positive/negative news. You can't really attribute that to the recent result of US elections. Not to mention that the rise was a very small one by bitcoin market standards (from about $73k pre election to $77k which is like 5%).