I am pretty sure those wires on the fpv drone was a contact sensor. That is brilliant. Simple loops that when you hit something they get pushed together.
that's how everyone does this for two years at this point, yes
slightly more refined version is crush switch, that is two thin metal shells in front part of missile. when it hits the target one deforms and makes a contact with the other one. used by, for example, french HOT-2 missile but probably many others considering how simple it is