Custom post type clean shortlink

Yes this is correct. You can choose custom permalink the way you want. But it is limited to these official tags only.

And %post_id% is one of those tags so you can use it.

Just a note here you need to end the custom structure with post ID or name as codex says

Make sure to end your structure with either %post_id% or %postname%
(e.g. /%year%/%monthnum%/%day%/%postname%/) so that each permalink
points to an individual post.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)