We really need to get away from using "aquasoil" as a generic term in the hobby, as it confuses the heck out of some people and gets livestock killed. Aqua Soil is an ADA brand. Aqua Soil Amazonia, as an example. Releases tons of ammonia upon initial use. Y'all can just assume how that goes in tanks with sensitive livestock with unsuspecting end users who don't yet know any better.
The type of specific substrate you're using - the brand - is really important here. Several brands release ammonia. Some don't. And that means some soil-based substrates should not be added to a tank without some advanced preparation. If someone is trying to deal with ammonia being released, substrate needs to be "cycled" in a separate container outside the aquarium prior to being added to an already functioning system.
Note - it's also not a good idea to rinse or agitate dirt and clay-based substrates like Aqua Soil, Fluval Stratum, Controsoil, Tropica Aquarium Soil, et al, because that can lead to quick breakdown.