The recovery server could not be contacted

Trying to reinstall Catalina, and I've been getting this error on online installation via recovery. Here is some info about my setup and what I've tried so far:

A ThinkPad x230 with a nonworking wireless card on recovery (only works on full os).
An Intel 82579LM ethernet card.

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• Changing OS date and time via bash;
• Changing my DNS to 1.1.1.1/8.8.8.8;
• Recreating the installation media;
• Trying a different OS version (both Catalina and Mojave);
• Switching ethernet's kext versions;
• Switching from OpenCore to Clover;
• Trying out USB tethering via HoRNDIS instead of ethernet;
• Trying out mobile data instead of my home wi-fi.

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Parts of the log that caught my attention (full log can be found here):

Jul 26 01:52:33 MacBook-Pro osinstallersetupd[696]: OSISSoftwareUpdateController: Failed to load catalog https://validation.isu.apple.com/content/catalogs/others/index-Golden-ProdFused-and-Recommended-1.sucatalog: Error Domain=NSURLErrorDomain Code=-1003 "A server with the specified hostname could not be found." UserInfo={NSUnderlyingError=0x7fb8ecc1e5f0 {Error Domain=kCFErrorDomainCFNetwork Code=-1003 "(null)" UserInfo={_kCFStreamErrorCodeKey=8, _kCFStreamErrorDomainKey=12}}, NSErrorFailingURLStringKey=https://validation.isu.apple.com/content/catalogs/others/index-Golden-ProdFused-and-Recommended-1.sucatalog, NSErrorFailingURLKey=https://validation.isu.apple.com/content/catalogs/others/index-Golden-ProdFused-and-Recommended-1.sucatalog, _kCFStreamErrorDomainKey=12, _kCFStreamErrorCodeKey=8, NSLocalizedDescription=A server with the specified hostname could not be found.} Jul 26 01:53:33 MacBook-Pro osinstallersetupd[696]: OSISPredicateUpdateProduct: Incompatible Apps List: Timed out loading catalog Jul 26 01:53:33 MacBook-Pro osinstallersetupd[696]: OSISPredicateUpdateProduct: OS Installation Payload: Timed out loading catalog Jul 26 01:53:33 MacBook-Pro osinstallersetupd[696]: OSISPredicateUpdateProduct: Incompatible Apps List: No products found. Jul 26 01:53:33 MacBook-Pro osinstallersetupd[696]: OSISPredicateUpdateProduct: OS Installation Payload: No products found. Jul 26 01:53:33 MacBook-Pro osinstallersetupd[696]: Failed to find incompatible apps list on software update catalog Jul 26 01:53:33 MacBook-Pro osinstallersetupd[696]: Predicate update product fetch failed with error: Error Domain=com.apple.OSInstallerSetup.error Code=300 "The recovery server could not be contacted." UserInfo={NSLocalizedDescription=The recovery server could not be contacted.} 

I've gone through countless forum posts and GitHub open issues, and can't seem to find something that could help me with my issue.