I don't get the reference (or know what scrap tokens do) but I really don't think this should be an artifact planeswalker

I'm now adding all references as bold flavor text to help with that.

This is a Runner identity (kinda like a planeswalker) from Android: Netrunner. It's a malevolent artificial intelligence (hence the artifact) who creates permanents whose only use is to be sacrificed.

I get that its an AI, but so is Karn and He's not an artifact. Planeswalkers aren't designed to have other types.

There's nothing in the rules preventing it - there's at least one that spends some time as a creature. Though this isn't really taking advantage of its extra type, it's just an extra vulnerability.

Being a planeswalker overwrites all other types. It's insanely abusable mechanically to have them be artifacts, and no one questions why they aren't creatures. Note that Calix isn't an enchantment either, even though he's nyxborn

You bring up a fair point. WotC has not printed Planeswalkers with other card types even when it would have been appropriate.

I do usually follow official design policy, but here I think I'm gonna keep it an artifact to see how it plays. There are two reasons for this: one of the goals of this set is to try out a lot of new things, and I don't need to balance cards around anything outside of the set.