Maemo Leste is (currently) based on Devuan, not older versions of Maemo.
You should read up on the history of Maemo itself, and why a desktop environment & so many applications already exist.

Most people here probably hope for Maemo Leste to work on a phone that is running an older version of Maemo already. The Pinephone is a fairly recent addition to the list of supported devices.

Did you say you edited this page? I still don't see actual installation instructions there? Compare to the N900 page.

Anyhow, welcome to talk.maemo.org, buffer!