https://gerrit.wikimedia.org/r/plugins/gitiles/wikimedia/portals/ still says:
www.wikipedia.org is built using a modern (circa 2015) front-end development stack which includes HTML templates, CSS preprocessors and build tooling to generate a static, optimized HTML page. Sister project portals (e.g. www.wiktionary.org) are generated using these Lua templates on meta-wiki. After these templates are updated, the pages need to be pulled into this repository for deployment.
This needs to be updated to describe the current process.