I think what they are saying is that it is possible to do physical damage to the CAM with the CAS interface and to damage the contacts of the CAS itself, nobody is going to cover the CAM or interface against self inflicted damage.
Once you change the software on any of this type of equipment, you in effect void any warrantee, but as far as I know Toecutter's will always help if possible.
PS I don't believe that there are any close ties between Astratech and the Toecutter forum, but even if both offered the same service and price, I would always go to Toecutter's, as the money goes straight towards running the forum.