Is the ‘parse_query’ filter still valid to change filtered content on admin list view?

There’s a thing: this is not necessarily needed nowadays. This is not a strict answer to my question, but a possible very easy solution for most needs.

As of wordpress v3.5, you can pass 'show_admin_column' => true to register_taxonomy. This does 2 things:

  1. Adds the taxonomy column to the admin post type list view
  2. By clicking the name of the term on the taxonomy column, it will in fact filter the list to that term.

So, not exactly the same as having a select, but almost the same functionality, width just one row of code.