Hylix carbon fork and compression plug
Some things to consider:

The plugs only purpose is to be strong enough to not move up when you tighten the headset down.
The steerer will be clamped by the stem, so the stem will reinforce the steerer once clamped.
The top cap recommended torque is probably 4-6Nm.
Support the top of the steerer from crushing. Although it is often recomended to add a 5mm spacer ontop of the stem so the top of the stem in not flush with the top of the steerer to help with this.

So my advice if you're worried about the steerer's integrity would be tighten the plug to a lower spec than you think and try it with the top cap, only tighten the plug further if the top cap pulls it up.
As the stem will clamp the steerer with more force than the plug expands with, you shouldn't worry about the plug damaging your steerer as you ride.
So, torque specs are in general only advisory in the sense that they will a min and max value. If you're careful and mindful of what you're doing, you don't need to look at the plug torque at all, just tighen enough so it doesn't ride up, making sure at no point you pass a damaging amount of torque (more than 10-13Nm in this case).