I just don’t see it. They seem to be just saying that these attacks probably aren’t (mostly) about escalating right now because Russia has their hands fully (thanks to Ukrainian sacrifices), but simply about trying to disrupt both NATO internal cohesion and support for Ukraine. Of course, if they can kill two birds with one stone, all the better.
Seems like a completely reasonable analysis of Russia’s motivations. I don’t see any moral justification there.