Volodymyr-Volyns’kiy is not a comparison to be drawn, but a part of the Katyn narrative; the badges of Josef Kuligowski and Ludwig Małowiejski were discovered in the mass graves, both Polish POWs transferred and claimed as victims of Katyn. But you’re right that it is not explicitly about Katyn, and upon further reading the “reverse” interpretation you made is correct. Sorry.
No. It’s discussing how Ukrainians are reframing nazi (And ukranian nationalist/nazi) crimes as Soviet crimes, not in specific reference to Katyn, but in reference to mass graves found in Ukraine. Come on man. The Katyn massacre wasn’t a 1941 massacre committed against predominantly Jews in Volyn. Its off by a year, the entire country of Belarus, and an ethnic group.