Upvote:2
I assume you bought your tickets after 31-1-2018, if so, the limits on this site are what you need to work with.
As you can see, it has different limits based on different destinations, that is size limits, and there are number limits depending on where you fly to.
If you do not fly to one of the exception destinations, these are the rules:
Economy Deals and Economy Saver Fare Choices: 1 bag, up to 23kg Economy Classic and Economy Flex Fare Choices: 2 bags, up to 23kg each
Most of the exceptions have a lower level of 2 bags up to 23 kg each, but they mostly do not show the Economy fare you mentioned.
I guess the information you found is older, there were new rules in 2018 but also in 2015, and the rules seem to go toward one bag with a maximum of 23 kg.