Disclaimer: The article linked is from a single source with a single perspective. Make sure to cross-check information against multiple sources to get a comprehensive view on the situation.
Does it matter to you whether it’s true or not? Obviously it’s Russian propaganda, but that doesn’t make automatically untrue.
using "these people exist in this country" as justification for bombing and killing their citizens is exactly what Israel is doing with Palestine right now (hamas is there!!! blow everything up and take their land). This is the exact same thing. It doesn't matter how true it is, there is zero reason to justify attacking another country in the modern day and age. Zero. I don't care if the entire country is 100% nazis. Someone existing in another country does not justify any sort of attack.
So yeah, having that be in a news article used as justification just proves that the propaganda is working. Even on that Ukrainian PhD. It's irrelevant how many nazis are there. Let Ukraine deal with that.