web wrote an answer about Scarpa Defender Alpine Touring Boot - Men's on March 26, 2014
I'm 100% sure it's not NTN compatible. It's definitely compatible with TTS since Wasatch sells the boot specifically for the TTS system. I think it's compatible with NT Bulldogs.
It's a different color of the F3 boot, which is not NTN compatible.
I agree that these should be removed from the telemark boot section. they are Randonee/Alpine Touring boots. Until Backcountry starts selling TTS or Bulldogs, at least.
...Too bad you can't comment on SAC any more. The same misleading description is on that website.
If these are anything like the TX boots, they come with a shim that goes in the crampon slot in TLT tech bindings. G3 sells a shim seperately that makes bellowed boots work with the onyx/ruby.