Facebook has produced the best open source software seen in the last 20 years. React basically solved front end frameworks, and pytorch steam rolled tensorflow.
> The quote above says that not being an engineer will stop promotion.
Speaking as a DS who knows a lot of FB people, this is totally true. If you have a product team deliver something cool, the engineers on that team will normally (modulo variability) be rewarded a lot more than the DS people. Sometimes PM's get some of that, if the product is very successful, but the variability is lower and the mean is higher for engineers at that company (apparently).
The fact this structure can still produce good software is neither here nor there.