(probably) bogus rather alarming warnings when using GitHub plugin correctly

[plicease]

use alienfile;

plugin 'PkgConfig' => ( pkg_name => 'libtcod', );

share {
    plugin 'Download::GitHub' => (
        github_user => 'libtcod',
        github_repo => 'libtcod',
    );
    plugin 'Extract::ArchiveTar';
    plugin 'Build::Autoconf';
};

as you can see it is not directly using the regular negotiator

git:(pu) 10:18 Alien-TCOD » carton exec af download
Alien::Build::Plugin::PkgConfig::Negotiate> Using PkgConfig plugin: PkgConfig::CommandLine
Alien::Build::Plugin::Download::Negotiate> !! WARNING !! WARNING !!
Alien::Build::Plugin::Download::Negotiate> !! WARNING !! It looks like this alien is using the regular download negotiator
Alien::Build::Plugin::Download::Negotiate> plugin on a GitHub release page.  This will typically not work due to changes
Alien::Build::Plugin::Download::Negotiate> in the way GitHub release page works now.  The Alien should instead be updated
Alien::Build::Plugin::Download::Negotiate> to use the Download::GitHub plugin, which uses the GitHub API to find available
Alien::Build::Plugin::Download::Negotiate> releases.  See: https://metacpan.org/pod/Alien::Build::Plugin::Download::GitHub
Alien::Build::Plugin::Download::Negotiate> !! WARNING !! WARNING !!
Can't locate Mojo/DOM58.pm in @INC (you may need to install the Mojo::DOM58 module) (@INC entries checked: /Users/perigrin/dev/Alien-TCOD/local/lib/perl5/darwin-2level /Users/perigrin/dev/Alien-TCOD/local/lib/perl5 /Users/perigrin/.plenv/versions/5.38.0/lib/perl5/site_perl/5.38.0/darwin-2level /Users/perigrin/.plenv/versions/5.38.0/lib/perl5/site_perl/5.38.0 /Users/perigrin/.plenv/versions/5.38.0/lib/perl5/5.38.0/darwin-2level /Users/perigrin/.plenv/versions/5.38.0/lib/perl5/5.38.0) at /Users/perigrin/dev/Alien-TCOD/local/lib/perl5/Alien/Build.pm line 337.