Whoever told you “They also stated the foam tiles are a field element and cannot be used to restrain a robot.” was not someone who should be doing what they are doing. That person lacks the brain power and reasoning skills for this very simple task. If it were true, then we would have to somehow measure robots suspended in the air and see if gravity were to bring the robot out of size.
There is no rule that states what you say this person has said. If that is really what was said, then it is a very sad day for Vex robotics that we have to get volunteers that are that lacking in reasoning ability and are on that much of a power trip that they make rules up just to keep someone out of a competition.
This response was me being restrained.