I'd rather run a squirt of Lanox when required than have the screen cut out - I just don't trust them to do it right....
I can fully understand that thinking as i've had issues with windscreen replacements before.
In an old Mazda, i needed a new screen due to large stone strike. The screen was repalced at my home by a 'professional' that tried to save a few dollars by not including some spacer that should have be used on this Mazda. The end result was lots of wind whistle, water leaks and a call back. He removed the screen hoping to reuse the old one but obviously it broke and he had to supply a new one. Then i had to listen to his swearing and profanities while he installed another screen. Not a great process to sit through and hardly what i'd call professional.
As frustrating as that was, using sprays/oils would be just as frustrating unless Holden specified what should be used and how to have it applied, then warrant it will not damage paint, rubber, plastic, headliner, etc. I don't want to be a Holden beta tester with my MSE.
AIUI, we are not quite at that level of documented and warranted solution (other than a full windscreen replacement)
It's a loose loose.