Nerf used this way is more in analogy to the toy guns (Nerf as a trade name, they launch foam projectiles, there even exist hobbyists who will upgrade them to be more energetic/destructive), it means to make the system ineffectual in some way that blunts a powerful feature, often with the stated goal of protecting the user.

Someone already replied about "nerf", which I learned recently myself reading some comments here. And when I find words new to me, my first personal reaction is rather to check for it in online resources like Wikitionary: https://en.wiktionary.org/wiki/nerf#Verb_2

Don’t get it wrong: asking for clarifications is also a perfectly legitimate way to learn. And you often get more than initial expectation in that way. But if you ever fall in a case where you don’t get a reply or the reply don’t help, remember you are not powerless in finding some answers through online resources.

So, expressed a bit differently the initial response stated something like "it’s not always easy to avoid downgrading many other interesting and legit possibility of a device when trying to tweak it so it becomes less dangerous in some terrible scenario it could be involved into."

Let me know if it’s making the response more clear to you like that, please.