the problem with electrical tape on its own, is it cannot handle the internal air pressure and starts to depress into the spoke holes, often causing leaks or split in the tape.
I’ve seen this numerous times on customers bikes where they have used it, with failure to seal a puncture, loss of sealant and finding dried up sealant in the rim bed. You have to wrap many times to make the tape stiff enough, and it often starts coming unglued after sealant exposure
when I worked at freeborn (the original stan’s distributor) we sold 100’s of tubeless wheel setups every year – degrease rim with Iso alcohol, couple of wraps of electrical tape to seal the spoke drillings, then quick wipe with Iso again, and wrap some Stans/Roval whatever tubeless tape around to completely seal the rim area. the electrical tape acts as a last defense if the main tape failed/split or leaked
works great. much easier to reapply new stan’s tape if needed.