This is a conspiracy which continues a series of disinformation attempts concerning the construction of the Belarusian NPP. It is consistent with recurring narratives about Latvia as a vassal state of the US and the prevalence of fascism and Russophobia in the Baltic countries.
Taken that Lithuania considers the Belarusian NPP as insecure and intends to end energy imports from Belarus and that until recently, the Lithuanian-Belarusian border, had been serving the Baltic states as the only point of trade in energy with third countries, Latvia decided to open an energy trade point at the Latvian-Russian border. It is groundless speculation that Latvia sought Washington’s approval to make this decision. Instead, as the Latvian government stated, it consulted neighbouring Estonia and Lithuania and the European Commission over this issue.
See previous disinformation cases alleging that Latvia lost its sovereignty to the EU, that its authorities destroyed national banking sector on Washington orders, and that Nazis rule present-time Latvia.
Finally, the accusation that Latvia is attempting to revise the results of WWII, it is actually Russia who has published a series of disinformation attempts on this over the past weeks, see, for instance, here, here, here, and here.