That was my impression as well. What he wrote about localisation as well - they are trying to localise text in RN files, native iOS files and Android files, maybe using a different approach for each platform, so of course it's complicated.
I managed to localise a relatively large cross-platform app built in Electron and React Native using gettext and had no problem with it. It supports 18 languages and people send me update from time to time, which are very easy to integrate.
It seemed a large part of their frustration was integrating the native with react native. I think too if you decide to use react native you don't hire more iOS and Android specific devs, you hire react native devs and replace the entire native codebase.
I managed to localise a relatively large cross-platform app built in Electron and React Native using gettext and had no problem with it. It supports 18 languages and people send me update from time to time, which are very easy to integrate.