I get your thinking with saving money by doing certain things yourself. Unfortunately, for the timing belt the radiator hoses and the tensioner need to be removed to perform the service so there likely is little saving associated with you doing those.
I would say as a next step, pull the accessory belt and start the truck and post of video of what that sounds like. That might help clear up the noise a bit since the original video has the accessory belt still on and it is a bit hard to identify.
If the noises continue with the accessory belt off I think it would have to be timing belt related. Do you know if all the idlers and the water pump were replaced at the time?