FAQ is to late, these are things that should have been (easily) fixed in development. (Srsly! Nobody said: "hey guys, you made it so you can put a dozer blade on a flyer unit, maybe we should change something here?")
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Fixing the fenrisian wolves is literally adding "-you control" to "attach to an army unit-"
Fixing the kurgaths nurglings is simply changing " after a unit moves " to " after an enemy unit moves ".
Oh and dozer blade should be called "extra armor" It adds +2 hitpoints and it doesn't do anything dozerblady to begin with!
Hindsight is a wonderful thing, but no matter how much review cards go through there will always be silly mistakes that get missed. Released cards will get exponentially more playtesting in the hours after their release than is ever going to be practically possible during development, that's just the way publishing goes.
The wolves probably would benefit from that calcification as it would be pointless to attach it to an enemy unit if the exhausting is to be considered a cost rather than effect.
Ku'Gath's nurglings are not "fixed" by simply adding enemy unit, that just nerfs them (they are probably intended to damage friendly units as part of Ku'Gath's theme (damage reassignment). But then I quite like how annoyingly complex this card is. I can easily see myself killing most of my units and losing several games by accident with this card.
There is nothing wrong with Dozer Blades, but something more generally applicable from a thematic standpoint would have worked too. I suppose they could have had it be attachable to tanks only, but that is beginning to narrow its application a bit much. I'm sure there will be many more weird thematic card interactions made possible as the card pool expands further. Maybe Valkyrie pilots like flying around at ground level and ramming things without getting shot down, just as the tank commanders like hitting things with swords...