From my understanding that is a community driven project and does not have any official contribution from Pure Storage. I also don't know how active the updates and feature management is with the contributors either.
When Pure initially reached out to Proxmox about building out an official integration we were essentially directed to contribute on the community and open source side of things and that Proxmox did not have plans to build a UX plugin spec. There have been requests made for Pure to develop an official integration plugin with Proxmox, but right now it's not a committed or funded project.
We have created a quick start guide for using Proxmox and do have work in progress for adding to that quick start guide. And we will be working on some demos to add to that as well early next year.
https://support.purestorage.com/bundle/m_proxmox/page/Solutions/Proxmox/topics/t_connecting_proxmox_to_flasharray.html