Here's a working 2570p Catalina EFI that I found on the interweb. Just create a bootable Catalina USB using the createinstallmedia approach, install clover on it, mount its EFI, delete the EFI folder and put the EFI that I attached.
Use case: You just want to install Catalina 10.15 on 2570p as fast and as painless as possible. If you tried installing Catalina on your 2570p using RH's guide and kept on getting stuck on boot or whatever, use this EFI. After a successful boot to the desktop, you then have the option to learn more by following RH's post-install procedure. But for me, this EFI is enough as it works as expected (SpeedStep works). If you decide to just use the EFI as is, just generate a new serial number using Clover Configurator disable hibernate mode using RehabMan's terminal commands mentioned on this guide.