It would work well, and you should use it with this mission if you want to (I have to release a version of this scenario without the custom unit camouflage values which I can easily do if you want me to). There are pros and cons with using HATG in this mission.

1. There is quite a lot of code being processed in HATG including event handlers and equipment/terrain/weather condition checks (I haven't looked at its code long enough to get an accurate assessment). It will reduce performance of Arma at the baseline, which gets worse with multiple AI units as there are in this mission.
I noticed micro lags when using this mod on an empty Altis map when crawling from one type of grass to another type of grass which is something I don't want when playing because it kills immersion for me.

2. The vanilla AI already distinguish your stance, and whether you are in a bush vs flat ground (flat ground and grass are treated as the same to the vanilla AI), and current movement level when making decisions about detection. They even distinguish different levels of light an object is in. In a night mission, being in shadow vs being in moonlight makes a significant different to the vanilla AI and can be the difference between detection and non-detection. I have tested this and released a night version of this mission.

3. HATG distinguishes between different types of clothing, vanilla AI does not, which creates a more immersive experience. HATG handles detection more precisely than vanilla, it is possibly more consistent, and the AI makes more complex decisions with more data. It is a more immersive mod.

At the end of the day it depends on whether you prefer the performance of vanilla AI with light scripts or the complexity of HATG for a realistic experience.