I’m afraid it does not. The wording suggests it does, but it doesn’t. I tested it and even asked others about it in the below post.
If it worked on all sources of toughness gain instead of just coherency regeneration then the ogryn’s heavy attacks would restore up to 55% of total toughness from the possible 120% replenishment increase the character has access to.
I’m afraid it’s simply a case of very poor and inaccurate in game descriptions.