They are only doing that due to the amount of historical code that would need to be changed. If you search that page for `@type` you'll see plenty of references, especially for the hook documentation. As such, WP-Parser will support `@type` without any problems.

The important note they make is at http://make.wordpress.org/core/handbook/inline-documentation-standards/php-documentation-standards/#deprecated-tags - again, they are covering themselves from making massive changes until PSR-5 is actually confirmed, but for the sake of a plugin with one property, you're fine to go ahead with it :-)