I wanna buy this jeep but can't decide if it's normal noise or engine knock listen past the revving and you'll hear need advice asap

https://youtu.be/F0XVVOD29kA

 

Doesnt sound normal to me. Im thinking the engine. What or where, i dont know. Rods, maybe? I dont know those engines. Pause at 23 seconds. The tube just behind the airtube looks like it has a hole in it. Like it was punched with a screwdriver or something. I dont know what that tube is for, but it stands out.

Where is it located? Them fasteners and pullies have a lot of rust for being a 2007. Doesnt look like the hood was opened for a very long time with that layer of dirt and dust up top. Was it sitting? And that lower radiator hose clamp looks like it was never touched, which has me questioning its service history.