In your site configuration, this will allow you to access term metadata, but Hugo will not render the authors taxonomy or term pages:
[[cascade]]
[cascade.build]
render = 'never'
[cascade._target]
path = '{/authors,/authors/**}'
After doing the above you can still access term metadata with something like this:
{{ with site.Taxonomies.authors.Get "author-a" }}
Name: {{ .Page.Title }}<br>
Email: {{ .Page.Params.email }}<br>
{{ end }}
Or this:
{{ with site.GetPage (printf "/authors/author-a") }}
Name: {{ .Title }}<br>
Email: {{ .Params.email }}<br>
{{ end }}