Unknown drupal_view() function although Twig Tweak is installed
If a module defines new twig filters or functions, they need to be manually excluded from the blt linter. Per a comment in the BLT issue queue, you can make these exclusions in blt.yml like:
validate:
  twig:
    functions:
      - drupal_block
      - drupal_field
      - drupal_view
      - drupal_block
      - drupal_region
      - drupal_entity
      - drupal_field
      - drupal_menu
      - drupal_form
      - drupal_image
      - drupal_token
      - drupal_config
      - drupal_title
      - drupal_url
      - drupal_link
      - drupal_messages
      - drupal_breadcrumb

This is also documented in the Overriding variables at runtime section of the blt docs (it's near the bottom of the section, under the tests: list item).