wouldnt Xfce have to rebrand though? lol

It could be using the HTML email renderer. Best to disable HTML view for emails unless its a know good source.
View > Message Body As > Plain text

No mention of PPS in the list of materials, but given the other materials listed it should also be usable on this printer.

Wow this is the first 3D printer they showcased in a while that i find actually interesting.