I'm at work and can't watch the You Tube video, but two questions. Does it sound like a laughing monkey? Is your jeep an 05/06 (fill in your profile by the way)? If the answer to both of those is yes, then you need to go to TJ Tech and read the thread on the OPDA (oil pump drive assembly) issue.
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It does sound like a diesel. I have already replaced my timing chain already motor has 122×××. When its cold you can only hear it. When its warm it soumds normal like any other engine. I dont use a fram filter. Had oil pan off before and a good friend thatsba mechanic was pushong up and down and side to side against the pistons. No play in them. Crank pulley does wobble a little. After timing chain fix the noise went away for a few days no knocking or ticking at all. 3 days later the same diesel sounding knock was back.
Yes if go up to 2500 its gone. I teied seafoam oil addictives, but its coming from the bottom end. Thats where it seems like its the loudest also the front too. I use a solid piece of pipe and put it everywhere I could to see if I could pin point it and I got nothing. Btw I habe no lose in power. Back tires will spin if I got on it