Can i use route ID for Link template 'edit-form' for entity type? Can i use route ID for Link template 'edit-form' for entity type?

I'm following this tutorial

over there he use:

 *   links = {
 *     "edit-form" = "flower.edit",
 *     "delete-form" = "flower.delete"
 *   }


while flower.edit (i assume) is from below route.yml:

flower.edit:
  path: '/admin/structure/flowers/edit/{flower}'
  defaults:
    _entity_form: 'flower.edit'
    _title: 'Edit flower'
  requirements:
    _permission: 'administer site configuration'


but when i run, it throw me an error: 


  Uncaught PHP Exception
  Drupal\Core\Entity\Exception\InvalidLinkTemplateException: "Link
  template 'edit-form' for entity type 'flower' must start with a
  leading slash, the current link template is
  'flower.edit'" at
  \core\lib\Drupal\Core\Entity\EntityTypeManager.php
  line 97


I know i can just use: /admin/structure/flowers/edit/{flower} to solve my problem.

but the question is: is it actually possible to use route (instead of path) in entity links config?
The tutorial is from 2014. Since then the link templates have changed from route to path. See change record:

Previous link template format

   links = {
     "canonical" = "entity.node.canonical",
     "edit-form" = "entity.node.edit_form",
     "delete-form" = "entity.node.delete_form",
   }



New link template format

After the change, the path is used.

   links = {
     "canonical" = "/node/{node}",
     "edit-form" = "/node/{node}/edit",
     "delete-form" = "/node/{node}/delete",
   }