My DNF config file:
[main] gpgcheck=1 installonly_limit=3 clean_requirements_on_remove=True max_parallel_downloads=8 metadata_expire=-1 # exclude=kernel*
Fedora 30 always uses
3 parallel downloads instead of
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As far as I can tell, this option
max_parallel_downloads has not actually been implemented. I grepped through the installed Python source on my Fedora 30 laptop, and then searched the project's github repo, and found only the references in the documentation.
I would recommend filing a bug report.