That is not what I said in this specific case, I just don´t think it will a remarkable difference and I am not really in favour of these kinds of - in my opinion - useless killing incentives, even if it is about introduced species. ( It´s something else if it is done with a sustainable, thought-through plan… I am not per se against erratication projects as they at times worked out on some island habitats with a lot of willpower, time and endurance)
However, as I also pointed out thats a call each person has to make for themselfs… but just be aware that it quite probably won´t change a thing, so I don´t think the reasoning to “kill an neozoon to help nature” should be the argumentation behind it. If you want to collect and kill the snails to have a canvas for art - well I guess you could and nobody woud really care.
And btw: Just because you can distinguish them easily does not mean everybody can. For example, when around the 2000s the news made round that an invasive ladybug invaded Germany, I recall that many people went for trying to kill ladybugs and I was for sure not the only person trying to educated people that not every ladybug is bad … and btw… Harmonia axyridis is now well established despite all the effords.
And also Lissachatina fulica seems to be very recognizable due to the size and this might be true for some regions of the world, it is not for all. For example in Colombia I ran into quite impressive large snails that could easily be mistaken for the Giant African, if you are not wo well into Gastropods
e.g. https://www.inaturalist.org/observations/74196281
https://www.inaturalist.org/observations/61488349
https://www.inaturalist.org/observations/13380247