Mike, The clamps are sort of like a giant hose clamp, it looks like they can be adjusted when necessary. I would assume they had some good research before they just slapped the walkways in, but you never know.
The platform areas at the trees are cut out wider than the trunk and they are made of 2x8 material so they should be able to knock them out wider as necessary, the trunk of the tree at each platform is covered with a heavy mesh netting from foot level to about 8 feet up - my guess is to reduce damage to bark by peelers and grabbers. The guy wires for the platform areas are attached to the platform itself, the trees are not guyed. Anyhoo, I figured at a glance it looked like things were fairly harmonious. I have heard of a project in South America done in this fashion to allow scientists to study the forest flora and fauna without actually impacting on it at ground level, they figured the tree walk type of observation system was the least harmfull. I believe a local expert, Julian Dunster was involved in the planning and tree testing of that project, I havent been able to figure out if he had anything to do with the one I just visited. cheers.