The claim of "participation" in the so called partition is inflammatory. You make it sound like Poland was a party to some kind of an agreement to dissolve Czechoslovakia, when there is no evidence of that, especially in retrospect.
I think it’s pretty clear the comment was referring to the partition of the sudetenland, which Poland was absolutely a (albeit minor) participant in.
But thank you for linking the article. I’ve always kinda assumed that Poland was given the territories by the Nazis as a way to spread the blame. Turns out they demanded it themselves outside of the Munich conference.
https://en.wikipedia.org/wiki/Polish%E2%80%93Czechoslovak_bo...
I agree that the Czechoslovakian situation was less hopeful than that of Ukraine, at least for the moment.