Why winning Tsushima alone would not prevent the Russian Revolution

Would a Russian victory at Tsushima have prevented the 1917 Revolution?

Not by itself; it might help if Russia used the victory and saved naval expenditure to address deeper structural problems.

A single naval victory would not automatically remove the causes of the 1917 Revolution. Victory could provide prestige and political momentum, but only useful reform would convert that success into greater stability. Avoiding the enormous expense of rebuilding a fleet destroyed at Tsushima would release resources for infrastructure and other needs. The counterfactual therefore turns on what the Russian state does after victory, not merely on the battle result.