Yes you are right, the immobiliser does not stop you from "bumping" the car.
However, my immobiliser used to "cut out" the electrical system, ie: pre-heat, starter, lights accessories etc, so when it stopped working I used to just bump it and drive home. With a 3 tonne car that's great until you park on the flat or stall on a hill!
However, I could still start the car by shorting the starter solenoid and, as long as it was daylight and your window was open, you could start the car and drive it (making use of hand signals etc for turning).
You short the solenoid with a short piece of copper wire - the solenoid is usually easy to get to and the vehicle shouldn't be in gear. It all really depends on how your immobiliser is wired - mine was just a basic aftermarket jobby wired into the OE central locking/alarm.
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