Check Volkogonov on Google and than check Zemovsk. See who is more cited.
How to do this? By checking whose surname is giving more search results?
Well, Volkogonov has 98000,
Zemskov 286000, Zemovsk - 1

Congratulations, you have just invented a new word!
That 2.3 millions number is a joke. The text you quoted to goes on:
2.3 millions number doesn't include some categories of victims, but also including some other categories twice. That's why I stated 2-3 millions as approximate estimation around 2.3.
The famines were in part manufacutured - Stalin was waging war on certain segments of the population and wanted them to starve to death- and in part of the result of outright barbarism both in planning and executing the agricultural policies.
This needs to be proven - there are too many lies on this whole topic, I cannot just believe it.
10 millions is the absolute minimum, 20 millions is more likely.
I'm not discussing 10 millions number, as it seems to be the number including famine deaths. I don't have the data about famines.
Range of your estimations is amazing. I suppose, if error of estimation is 5 millions, you just cannot talk about any exact numbers from documents. Such data can be get only as a result of rough extrapolations and assumptions.
Compare with this:
1,575,259 people arrested by security police (1937-1938) (percent of political arrests from this number?)
1,053,829 persons died in GULAG (1934-1953) (what percent of criminals?)
786,098 executed political prisoners (1930-1953)
389,521 peasants died in exile (1932-1940)
86,582 people died in prisons (1939-1951)
Does Volkogonov give anywhere such kind of data, explaining how he got 20 millions in total?