Not certain if this news caused the recent price decline. There was a bloomberg article claiming 1,000 people own 40% of bitcoin which might have scared off investors. There could be other reasons behind the recent decline, or it could be a sell off as traders dump to turn their profits.
It is true that certain individuals who started bitcoin does hold the majority of the coins in circulation and it would definitely scare off any economist because they could manipulate the entire market if they plan on selling off the coins,i am not sure whether that is the reason of this decline,but the bubble has being taking the price without any breaks and may be because of that the price corrected ,will the Bulgarian government auction off the coins like the US ,i am not sure what they are planning with it.