I have a problem with the last sentence. It might be factually true but not supported by facts.
At the very best the Polish-Soviet war a preemptive war and it is really hard to claim a moral high ground in such.
Another point is that Lenin granted Poland independence in 1918 after centuries under Russian control. Let’s say the idea that he was going to take it back as a justification of an aggressive war by Poland in 1919 is... far fetched.
It is especially far-fetched in light of facts of existence of Intermarium concept which required Polish annexation of Lithuania and Ukraine.
Once again, the problem of Polish propaganda is that it denies that the Soviets maneuvers in 1939 were defensive in nature and weren’t in alliance with the Germans.
Yet, they themselves use the very Soviet arguments to justify their unprovoked attacks on Ukraine and Czechoslovakia.
As for the later I have no idea why it is not counted as a starting point of WWII. Poland and Germany did to the Czech exactly the same thing the Soviets and Germans did to Poland later.
True, the Polish had some claims to the Czech territory but then the Soviets had their to the Polish territory. The latter were captured from Ukraine in an aggressive war Poland has started.
Another important point is a semi-official Polish Doctrine meaning any Russia regardless form of government is a threat to a Polish state. Pilsudski had his vision to implement it. His successors planned to rely on Hitler in it and it was a short-sighted take. Nothing in Hitler’s book indicated Poland had to be treated differently than Russia.
That sounds a lot like Bill Clinton's parsing of the language, It depends on what the meaning of the word is is.
Nevertheless, a war that happened around 1920 which resulted in a peace treaty between the warring parties is not a justification for Germany and the Soviets deciding to split Poland in two at the end of the 1930's. The only rationale was revenge.