I think what they're trying to say is that developing plugins for nginx in Lua is not great. It's not a rant about languages.
This has to do with nginx not having the required features (features blocked behind the paid edition or GRPC non existent), forcing to develop plugins in Lua to compensate (the only supported language) and Lua is too slow for this sort of stuff (processing Gbps of traffic in real time is no joke).
That makes sense. Thanks. (I still prefer C - but I am admittedly getting old and C++ sucked in the mid-90s or so)
EDIT: BTW -- I am not going to argue with LUA throughput. I'm still not sure what the thinking was there (maybe time-to-prototype?) - but C plugins run faster than Apache's do. By, like, a lot. (And I like Apache! ...Having used it since 1996)
This has to do with nginx not having the required features (features blocked behind the paid edition or GRPC non existent), forcing to develop plugins in Lua to compensate (the only supported language) and Lua is too slow for this sort of stuff (processing Gbps of traffic in real time is no joke).