That doesn’t seem right that the Strata Manager could or would make submit a motion out of a general update issue – unless he was going to do so with a quote(s) as an actionable outcome voted yes or no by owners at the AGM? Seems a little strange. Also, as noted, is the chap saying the roof is no good the real deal or just another bloke with an opinion? Some just want to sell you a new roof.
As to if your block has enough funds, or not. That doesn’t fly. If there are group costs they need be costed and funded by owners otherwise the place will go to rack and ruin and just not how multi-owner places are required to pay for things and keep everyone’s property in good repair. The real costs need be made known and sadly, if some folks can’t cough up: your site is too dear for them and they are essentially needed to find the loot or sell up and move somewhere cheaper.