Every time JW publications try this tactic of saying some particular species has some 'amazing' trait that 'must' have been 'designed', they demonstrate how dishonest they are.
If this particular species of ant had to be 'designed' to withstand high temperatures, it would mean this specific species - and by extension all species - would need to be 'preserved' on the fairy-tale 'ark' rather than there only needing to be a few 'kinds' (a vacuous term with no taxonomic meaning).
In addition, they implicitly assert that their 'loving' god deliberately 'designed' all manner of 'cruel' things in the natural world, such as parasites, viruses, etc.
Back in reality, it is observable that species gradually adapt and become more diverse over time based on their suitability for their environment without requiring a 'designer'.