He’s referring to the overthrow of Czar Nicholas II and the Provisional Government led by Alexander Kerensky in February/March of 1917.
The Bolshevik Revolution did not occur until October/November 1917.
(Julian Calendar/Gregorian Calendar, Russia was on the Julian Calendar until after the Reds took over)
Wilson was the second worst president in terms of damage he caused, third is carter and first is 0.