The USSR census didn't record a population drop either during the famine 30s, FYI. The 1926 Soviet census recorded 147 million people, while the 1937 census recorded at least 162 million. The 162 million figure was reportedly a figure Stalin tried to suppress, as he had expected an increase to 170 million, though there is some historical quibbling over whether the 162 million figure was a lowball estimate.
No, I don't trust the US statistics either:
About 600,000 people died in the 1918 flu in the United States, and hardly anyone now considers it a topic worth mentioning. The government at the time even suppressed knowledge of it because it would take away from the war effort. 7 million people over 12 years translates to roughly 600,000 surplus deaths per year. And since most famine deaths are typically due to diseases brought about by weakened immune systems, I could see very easily how something like this would get ignored for not being newsworthy.
During the Soviet rule, many of those who allegedly died of natural causes may have their death certificates issued as such to hide the real causes of death & falsely recorded as such. With ~10M + 47M dead in the Civil War & WWII =~57M, + Ms more died sooner than normal after 1991. Combine that with decreased birthrate & it's easy to understand why the official #s r being exaggerated to keep the illusion that not all is so bad. Finally, food consumption varies & that's why the 86M has the biggest margin of error in it. However, it's still close to & between the other 2 figures.