According to the video you don't seem to automatically translate everything - thankfully! - but should you plan this in the future, please, please give your users an opt-out or a setting.

Just minutes ago I wrestled again with Youtube which doesn't respect my language preferences and tries to autotranslate not just the titles but also dubs videos in a shitty AI-translation, which I don't want. Youtube doesn't really seem to give you settings for this.

Machine translation may have gotten better, but it is still not right if you speak both languages. It get's the information across but always feels like the uncanny valley, it doesn't feel right. So my preference still is to never have machine translation between languages I already understand.

Automatically translating everything can be expensive (in terms of API cost, waiting period for the user). So I didn't want to keep it enabled for all posts.