Pioneer PDP-5030 compatibility with Apple TV 4K

doubt it

hdmi is required and only that (minus some versions of dvi"dvi is without audio")

support hdcp which is the drm encryption most protected material like netflix and prime rely on

https://en.wikipedia.org/wiki/High-bandwidth_Digital_Content_Protection

1. No. HDMI is the only supported connection method, and adapters won’t work for most content, because of HDCP.
2. No. The HDMI ports are directional (HDMI-in or HDMI-out only) with the exception of HDMI-ARC (which can carry audio in both directions).
3. The interface may react a bit snappier on the newer model, being a real app, but the streaming of content largely depends on the network bandwidth, both for the home network infrastructure and the plan with the ISP. Both models Apple TV box should be able to handle that just fine, as Netflix supports both.