need an ipod with NO wireless connectivity

That would be a much older model.

Honestly, I would suggest a different brand of MP3 player that is nothing but an MP3 player

Sandisk has them last I knew. And the main reason for this is that the iPod model you’d need is old enough I’m not sure if they are sold new in stores and you’d be struggling with older operating systems compatibility with newer computer operating systems to get data onto it.

I have one of these

https://www.sandisk.com/home/mp3-players

and they work great. a tactile button to hit so you can skip to the next track without waking up a screen, expandable memory to hold all your music (relatively speaking), and no wifi at all. Just a simple MP3 player

As to my DZ, well I did one jump once 20 years ago so far from an expert. But it worked as an online name back then

I asked why because the OP could just purchase a normal iPod Touch and just never use the WiFi or Bluetooth connectivity on it.

Just use it as a regular music player.

Connect the iPod Touch to the computer running iTunes.

Load it up with music from iTunes that are copied from music discs to iTunes on the computer and just play the music from the Music app on the iPod Touch.

It would be compatible with the current iTunes and much easier to get music in and off of the device.

You can even plug in a set of portable WIRED speakers to the iPod Touch for listening.

No WiFi of Bluetooth required.

Why would you need one with no wireless capability? like there are iPods that don't have any wireless capability but I’m not sure if they are sold new in stores and you’d be struggling with older operating systems compatibility with newer computer operating systems to get data onto it and there is no support for newer music types on iTunes like for example: songs you got from an Apple Music subscription.

Security from what?

Do you work for a government agency?

not to be rude but you make it seem like you're one of those people who think "someone is going to steal their info just by going near them", "someone is hacking/is going to hack my iPod", etc. etc.

and nowadays those problems are pretty much non-existent

Why does his ‘why’ matter?

He wants an MP3 player with no internet.

that’s his choice and his tech to use and live with, not ours. The why is none of our business. answering his question is enough.

Why does his ‘why’ matter?

He wants an MP3 player with no internet.

Sometimes the "why" is useful because it allows people to make alternative suggestions.

The iPod Classic is what you are looking for. We have 3 of them that we will never give up. They still work with the latest versions of iTunes.