I don’t take the Bolshevik’s word on it.
However Massie & Conquest do carry some weight and are not Bolshies! I’ve read all their works on the Imperial family & the Revolutionary period. (I’ve read others too!) Nicholas would have made a decent King of England - Constitutional monarch. He was outmatched and overwhelmed as an autocrat in the Russian system.
Now if Pyotr Stolypin has not been assassinated it might have been a different story!
He wasn't up for it, in retrospect, but this topic is a "what-if" kind of thing. If democratic forces in Russia (with the Czar as a figurehead, as in constitutional monarchies elsewhere) had prevailed over the Bolsheviks, the world would have been a much better place.
The Germans had everyone outgunned for much of the length of the war. The carnage for the Russian army must have been staggering, and when the Czar was deposed and Russia left the war, it freed up something like 70 divisions which the Germans could bring to bear against the western allies. Had the US not been entering the campaign, France and Britain would have been overwhelmed, and Italy and others would have likely just agreed to cessation of hostilities and concessions after their defeats.