Some regions/countries use a region/country-specific version of the app. Just a guess, but I would speculate that those countries that use a different app might also be using a different API implementation that hasn’t been reverse engineered yet.
The way that site gets its data is they leverage the reverse-engineered ordering API that the app uses, and try to place an order for a McSundae and then wait to see if the online order is rejected (because the ice cream machine is down).
Some regions/countries use a region/country-specific version of the app. Just a guess, but I would speculate that those countries that use a different app might also be using a different API implementation that hasn’t been reverse engineered yet.
The way that site gets its data is they leverage the reverse-engineered ordering API that the app uses, and try to place an order for a McSundae and then wait to see if the online order is rejected (because the ice cream machine is down).