Wizard, i think this would apply for someone who had thire car already tuned with their particular setup( especially larger injectors) then it would be fine to remove the jack belt a run NA as the ecu has the right scaling for the injectors and even so you would have to be careful.
Dave my friend here will be running for the very first time
It is also false economy skip the price of a flatbed as a dammage engine will cost more And if you are sneaky you can get your breakdown cover to pick up the tab .
TBF it does say "Just don't go into positive boost on the drive there. Either way, go easy on the throttle until you're tuned" But you are right, its not worth the risk. Especially if your driving somewhere thats quite a distance away