This is completely false and ahistorical. The first license associated with the term "open-source" was the MPL, which is a copyleft license.

Open-source never attempted to distinguish itself from free software in terms of licensing or content, and "free software" has always included permissive licenses.

You can find lots of free software licenses which are not copyleft listed on the FSF website, with links to longer commentaries on them. The FSF clearly identifies them as free software licenses, and always has.

https://www.gnu.org/licenses/license-list.html

this page is linked to from FSF.org here:

https://www.fsf.org/licensing/

Take a few minutes reading the publications of the organizations and movements you're misrepresenting. Take a look at the OSI's Open-Source definition as well.