The delete action menu item in the Plone toolbar uses pat-modal, with an actionOptions data object to provide configuration for the pattern. This is the rendered HTML:

<a href="https://blahblahblah/delete_confirmation?_authenticator=blah"
  title=""
  id="plone-contentmenu-actions-delete"
  class="actionicon-object_buttons-delete pat-plone-modal"
  data-pat-plone-modal="{&quot;actionOptions&quot;: {&quot;disableAjaxFormSubmit&quot;:true, &quot;redirectOnResponse&quot;:true}}">
    Delete
</a>

Both disableAjaxFormSubmit and redirectOnResponse are set to true. However, looking at the pattern source, it appears that the place where redirectOnResponse is checked would never be reached if disableAjaxFormSubmit === true:

https://github.com/plone/mockup/blob/master/mockup/patterns/modal/pattern.js#L383

Therefore, I would say that setting redirectOnResponse is superfluous.

The action menu comes from here:

https://github.com/plone/Products.CMFPlone/blob/master/Products/CMFPlone/profiles/default/actions.xml#L192