For anyone coming along and not trusting the title, it is misleading.

Infrared is one of the things mosquitoes use to find a target.

They still use CO 2 detection as part of their methods, this is in addition to, not instead of.

Edit: the relevant section of text

*Each cue on its own – CO2 , odor, or infrared – failed to pique the mosquitoes' interest. But the insect's apparent thirst for blood increased twofold when a setup with just CO2 and odor had the infrared factor added.

"Any single cue alone doesn't stimulate host-seeking activity. It's only in the context of other cues, such as elevated CO2 and human odor that IR makes a difference," says UCSB neurobiologist Craig Montell.

The team also confirmed the mosquitoes' infrared sensors lie in their antennae, where they have a temperature-sensitive protein, TRPA1. When the team removed the gene for this protein, mosquitos were unable to detect infrared.*

In other words, they still use the previously known ways to find a meal, and this is how they work up close. That's over simplified, but it's the important part because it gives info on how to reduce being "bitten". Loose clothing that covers the extremities diffuses the heat, making us "look" like we aren't the right kind of target wherever the IR is spread out wrong to their antennae.

The article is actually a really good one, but the title is crap

Edit 2: the paper https://www.nature.com/articles/s41586-024-07848-5