The list is far larger.
United states have already seized some bitcoins from criminal activities, which they own now. I think that it is also likely other countries are doing the same:
I also found this link from Investopedia, whcih mentions United States, Bulgaria, Sweden and North Korea as hoarding bitcoin.
Imho, it doesn't make sense to include those countries on the list of those just because they temporarily own some seized bitcoin as they will sell it off anyway, like they usually do with the seized stuff. For all we know, some of those countries may sold it already.
But yeah, I think it's way too early for lists like this.