1) The switch kernel has no network parts
2) The vast majority of network code is custom Nintendo, not FreeBSD.
FreeBSD sockets code is used in userland, but it's a minimal part of it and not really a good attack surface. Most exploits in the PlayStation scene have targeted the Berkeley packet filter which doesn't exist on switch.
Also even if you hack bsdsockets sysmodule it doesn't do anything for you -- it has almost no interesting privileges.