Cam phasers do make noise on tip in, this is normal. Most engine have some sort of noise at idle, I would not be worried if you can only hear it outside beside the engine or in a drive thru.
This repair is done when the noise is "Diesel-ish"
some of these loud tick you hear on the youtube videos... this is not "normal"
and the 5.4 is not suppose to make this noise!!
After the repair, this adresses a few reasons I have seen them tick.
The phasesrs are not aways worn. The phasers and the chains will make noise if the oil pressure is low due to blown seals or the chain is slack causing slap.
You guys know your trucks. obviously take this guide with a grain of salt and diagnose the problem before starting anything, so not to waste yoiu time and money