Did Britain refuse to support Anti-Bolshevik forces in the Russia before World War II?
No. In fact between 1918 and 1920 The British together with France, the United States, Japan and Czechoslovakia actively backed the anti-Bolshevik White Movement in the Russian Civil War. Almost a thousand Brits died in this conflict.
Check out: Kinvig, Clifford (2006). Churchill's Crusade: The British Invasion of Russia 1918–1920. London
Can totalitarianism exist in a liberal form?
I assume you mean in a lab or power planet. The answer is yes. Nuclear Fission Processes are shutdown using the SCRAM procedure (safety control rod axe man - the term was coined by Enrico Fermi). In light reactors (water cooled) this done by inserting a control rod that absorbs neutrons. For CANDU reactors a neutron poison is injected via the EPIS system (Emergency Poison Injection system).
In Nuclear Fusion the process is stopped by releasing the pressure on the plasma/fuel mix. Worth thinking about is that a fusion reaction is easier to control as it is not a chain reaction.
When did the meaning of Liberalism change from its classical roots?
It didn’t. Liberalism is the authentic classic version. In the United States Progressive groups co-opted the name in the early to mid 20th century as a way of polishing their progressive image which had become increasingly tarnished over time. The re-brand unfortunately stuck with the details lost to history. In Europe and Australia, Liberal Party Parties are closer to the original definition in political philosophy (although not always in action) than those who go by the same mantra in North America.
Why did Germany betray Austria and not provide assistance during World War I?
The Germans were fighting the French/British Empires on one front and the Russians on the other. The fight against the Russians relieved some of the pressure on the Austrian/Hungarian forces who could concentrate more of their efforts against the Italians and the Serbs. Anymore German assistance was unlikely as the nations was under naval blockade and was stretched to the limits on both the Western and Eastern Fronts for most of the war. While there was some relief to Germany when Russia pulled out of the war this did not last long as the Allied forces were bolstered on the West by the entry of the United States.