it’s not a short circuit- it’s low rezistance ;) but I laughed :) The link between processors, bucks and iCs is low voltage, for example 0.8V for iPhone. Additionally, poor meters do not recognize low resistance and treat everything as a short circuit, which is why you hear a beep. Look at the multimeter’s display - what do you see? Probably your meter is starting to squeak as low as 110 ohms. With such low parameters any resistance would be lethal to the signal.
You must a learn a lot of basic of electronic. Proper practice should be a buy a book (that normal one, traditional) and read about Ohm law, currents and voltages. That is basics. Buy a multimeter and read its instruction (papers) how to measurement. Than You will know that... low rezistant its not a short circuit. Don't watch youtube and ipadrehab anymore. You won't learn anything there, which would be valuable and necessary (but there are exceptions).
regards and fingers crossed