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Huawei is building its own DRAM fab, and it could reshape RAM prices for everyone
(www.xda-developers.com)
This is a most excellent place for technology news and articles.
They are making it from scratch. There are lots of sources but this is the first one I found. I assume they package it as well.
https://www.tomshardware.com/pc-components/ddr5/chinese-memory-maker-cxmt-enters-the-mainstream-consumer-memory-with-corsair-vengeance-ddr5-kit-chinese-made-dram-emerges-as-an-antidote-for-crushing-shortages
Foxcom assembles sub models into complete products. Still higher than slave labor level skills, but not as high as chip fabrication I admit. You need a skill base to assemble phones at a high level.