You should be concerned, ask me how I know. I listened to your video, but they are always hard to decipher without hearing the real thing and hearing where the noise is coming from. Things that come to mind are exhaust leak, oil pump going bad, oil pump pickup clogging up, or timing chain set issues. There are always things like bad lifters and loose rockers too. If it was my car, I would look into it.
1996 Mustang GT Vert
'96 Mustang Coupe V-6
2004 Expedition 4x4 EB
14 Mustangs owned to date. Wish I still had them all!
"Regulators, mount up!"
"There's no replacement for displacement!"