I listened to literally dozens of these intercepted calls. There is no way they are propaganda, they sound way too authentic, with the right terminology, expressions etc. - and yes, the Ukrainians definitely have the means to intercept them due to Russians' complete incompetence. They are real.
I agree, I listened to them as well, and I agree, they sound very authentic. Though this is just my opinion.
But what do I know, I'm just a Putin puppet, right, terr?