Dexter Deadwood I think he might be right tbh. I've reversed a landrover into a tree only a bit bigger than that (yes, yes, insert female driver jokes here) and it was fine- an uninterrupted root system is the same size as the tree canopy.
TBF teuchter is always wrong.
Your point about the root system is correct in so far as my limited knowledge can allow me to have an informed opinion of such matters. I would like to know more about how you reversed into a tree.