Sadly this is normal. Unlaunch initializes all hardware including WiFi and this can't be configured.[…]
Is it normal that the Wi-Fi indicator LED lights up on startup after installing unlaunch? It dims down right after booting to SysNAND or SDNAND with HiyaCFW but it stays on when running anything else from the unlaunch filemenu. I remember that I had Wi-Fi turned on when I was installing unlaunch on my DSi, so maybe that's the reason why it stayed like this. It could also be a feature rather than a bug, as I've read that unlaunch initializes Wi-Fi components on startup.
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Booting DSiWare from within TWiLight Menu++ also uses unlaunch and WiFi turns on again.