That's good for most websites, but it only takes the URL and sometimes websites are tricksy when you're trying to use CLI tools and figured I needed all the appropriate headers. I got an extension cliget which seems to have worked well enough. In the end I think this would have worked, but takeout gives you limited attempts to download a file before it cuts you off entirely and wanted to be sure.
Yep, cliget was the answer. Honestly an extension I wish I knew about sooner.