That statement was made before the release of bios 322, and 322 updated the fan curves to alleviate the heat buildup that was damaging the sd cards, as well as honoring the replacement under warranty considering that not all units were suffering the issue.
ASUS is offering a new BIOS update for the ROG Ally aimed at improving the gaming handheld in various areas. The company is not yet ready to patch an outstanding MicroSD card issue though, despite officially acknowledging it before the update's release.