Is the new iPod classic 7th generation 256gb they are selling on eBay really apple products?

I love my old school iPods - And we live remotely enough unless I want to stream from the net we have 2 radio stations almost reach through the hills to us and I enjoy music usually 8-9 hours of the day minimum.

I've several 160gb that I have used iTunes to download and transfer music from my own CD Collection. iTunes (Apple Music) and yes I back up my songs to a remote hard drive as I've some 48K songs there!

I use them in different locations one is plugged into main stereo for most of the house and outdoor music

One in bathroom with a Bose Soundlink mini for my morning start the day tunes

And one in our little Fiat for travel tunes.

Well . . . it's a long way to anywhere from here and I know my newest classic must be some 15 -16 years old! That's a lot of hours playing between them all!

The one in the Fiat is pretty much on last leg. It will not longer reboot or reset. I audibly hear a pop when it attempts to play! And to be honest it's 150 to 250 miles round trip to anywhere and a whole heck of a lot of rough roads!

So I started looking to see if I can get a replacement device -

eBay has all these sellers touting "new" iPod 7th generations and saying even 256gb are available?

I don't understand how these are available or what they are selling?

Are these truly an Apple product? Are they actually a Apple/Solid state hybrid?

And if so might it be simpler and probably more reasonable for my to rebuild my own with solid state chip and such - As I'm hearing this is possible to do?