You are right, but in seeing as a lot of the previous disscussions talked about how easy it is to bypass the immobilisers, if you physically remove a section of the wiring it then means that not only do they have to defeat the alarms immobilisers they then also have to replicate the wiring you have removed because there is a section physically missing they would then need to provide wiring and the time to bridge the removed section in order to get the car running again which would aso look quite suss rather than joining wires etc under the dash/alarm brain inside the car not attracting attention.
Depending on the location of the removed loom as well of course