I think the LiberTouch is a completely different mechanism.
The FKB47xx uses the Peerless mechanism. Key pushes on spring pushes on rubber dome.
In an ideal world, the rubber dome will collapse before the spring compresses at all, then the spring will fall very quicky (giving decent tactility, a small amount of clickiness, no hanging on return (something blue Cherries are bad about,) fairly accurate actuation, and good overtravel,) and then compress for the end of the stroke.
The thing is, this isn't an ideal world. The spring compresses a little before the rubber dome collapses, making it a very tiring keyboard to type on. Yeah, the keys may be lower peak force than something like a blue Cherry, but their force feels like typing through mud. (But, all of the benefits of the idealized version of the mechanism are there, it's just that it feels horrible before the rubber dome collapses.)