I need to implement hook_entity_bundle_info(), and I noticed that the documentation includes a link to Finalize API for creating, overriding, and altering code-defined bundle fields. In short, that issue says that is wrong to use the BaseFieldDefinition class because that class marks the field as a base field, which is not true, since the field is being added to a bundle.

Can the BaseFieldOverride class be used to implement hook_entity_bundle_info()?

Doing so, the example given for hook_entity_bundle_info() would become the following one.

function hook_entity_bundle_field_info(\Drupal\Core\Entity\EntityTypeInterface $entity_type, $bundle, array $base_field_definitions) {
  // Add a property only to nodes of the 'article' bundle.
  if ($entity_type->id() == 'node' && $bundle == 'article') {
    $fields = [];
    $base_field_definition = BaseFieldDefinition::create('string')
      ->setLabel(t('More text'))
    $fields['mymodule_text_more'] = BaseFieldOverride::createFromBaseFieldDefinition($base_field_definition, $bundle);
    return $fields;

According to the issue you linked the answer is no:

So, in theory, contrib modules can implement non-config-based bundle fields, but we don't provide an implementation class with which to do so.

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