Well, yes and no.........
It's sorted with a fully charged battery. I've tested most days since this upgrade and it's been fine. But over a week without charging the battery, and on a day when it was one degree C in the garage, it was slow to disarm. Leaving the key in place, I got one dot-dot-dash, then it rearmed.
A quick charge of the battery restored normal service.
So the voltage sensitivity is real, and just something to be aware of.
On my 2005 Roadster, the immobiliser light flashes until the ignition is switched on. This means that the sensor coil is not permanently live, and on this car there is no significant battery drain.
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) Plus 4