This argument falls on its face pretty quickly, philanthropic organisations whether they be charities or religious organisations don't just throw money at causes as soon as it comes in, that's totally unsustainable. It's the same with "hoarding" wealth, take the Vatican city as an example, it literally has multiple priceless artworks but it's proven to be better served charging people who want to see it to see it and then to use that money for various good causes around the world rather than selling certain pieces and using the proceeds immediately. A sustainable and constant income will be more beneficial to everyone.
Without researching it I'd guess this organisation is doing more than most to help homelessness and sick people in their community, and there is only so much throwing money at these issues can do, some homeless don't want helped, some sick people can't be cured and a precedent of throwing six figures at one child who needs an operation can't really be set because it'll only attract criticism the next time when they can't pay. Helping Folau is objectively absolutely deplorable but it's not something that can be made look worse because it should be used to help x, y or z when in all likelihood they already are doing enough in those areas and they were waiting to use this money for a cause when it arose, they just chose an awful one.
Obviously if they do nothing to help the vulnerable in their community this post is more or less moot, I don't care to look into much to be honest.