When you on the last occasion sought some advice concerning how to handle your upstairs neighbour’s renovations I posted that:
…those Owners will need to put that to a General Meeting together with whatever else they’re proposing by way of renovations to their Lot, and including details of precisely what’s proposed (i.e. plans & specs.), who’s doing the work (i.e. names / license & insurance details), and an written undertaking by them to be responsible for the ongoing maintenance, repairs, and replacement of all works comprising their proposal (see last para.).
You can add the specification of the acoustic underlay to the above, but your O/C will first need to know what impact noise level it’s prepared to accept as a “pass”.
…and in that “last para.” I also advised you that your Owners Corporation should seek some legal advice, particularly with regard to the preparation of a Special By-Law to amongst other things ensure that Owner/s of the renovated Lot properly maintain, repair, and replace those renovated areas; unless of course your O/C wants to forever be held responsible for that!
I don’t know why you’re having a General Meeting to “discuss” your neighbour’s proposal, because if that’s the nature of that Item on the Agenda, then discuss is all that you can do and an Executive Committee Meeting could have handled that!
Frankly I don’t think that your small self-managed Plan has enough information with which to consent or otherwise to the renovator’s proposal; so if in doubt don’t and instead seek some professional assistance! Experienced Strata Lawyers handle proposals such as yours on a regular basis.