I don't think one should try to extrapolate too much of the 4E troll's abilities from it's 3E minis stats.
True to an extent, but I wouldn't ignore it either. They seem to be calling out this ability as an example of the 4th edition Troll changes. The main difference is that almost every mini ability has a simple fire and forget mechanic while the RPG game is more complex. The RPG Troll may have one immediate heal ability, but can use it again when bloodied, for example.
Incidently, if you look at the stats vs 3rd edition Trolls...
RPG vs Mini (3rd Edition)
HPs 63 vs 60
MV 6 vs 6
AC 16 vs 16
Saves Average 6 vs 6
Attacks +9/+9+4 vs +9/+9
Claw Dam Average 9.5 vs 10
Rend Dam Average 16 vs 15
The Feral Troll mini has basically the same stats as every other Troll mini they've put out because they're all modelled on the same set of stats. Only the special abilities really vary between minis, and this Troll seems to be more inspired by the 4th edition mechanics, even though the stats are all 3rd edition.