Do the terms "winter" and "summer" in this context only refer to the northern hemisphere? Was Australia's "summer" bid to place the tournament in their winter? Presumably they have better weather in the winter.
Much of Australia is reasonably temperate. July in Sydney or Melbourne is in the 40s-50s Fahrenheit, which, while chilly, is both comparable to the climate for a large portion of the club season in Europe and vastly better than 100-ish for a sport that combines endurance running with interval sprints.
The argument is that they bid for a World Cup scheduled for June and July of 2022, so if the World Cup is not in fact scheduled for those dates, it was fraudulent for FIFA to solicit bids under the premise that it is.