Yep, always go in armed with the knowledge of what is and isn't required. I always carry a copy of this -
https://www.vicroads.vic.gov.au/~/me..._web.pdf?la=en - and have successfully argued many points. If I think they are wrong, I just drop this on the table and ask them to show me in this document where it says what they are claiming.
Section G clearly shows the only times a windscreen can be failed - it's very specifically worded as are all sections. If it's not in VSI26 they can't fail it. If they claim they can, simply tell them you'll report them to Vicroads - I've done this before as well, and it changes their minds very quickly. 😉