It should show the translated reviews. But I'm afraid that because of I need to use custom code to show the translated reviews on the product pages, that I need custom code to make it work with the all reviews block as well. Can your team look into this please?
can you confirm if the block works when the workaround (child theme) is deactivated?
If not, we may need to reproduce this issue in a sandbox environment. It's unclear why it worked in the linked example, but not on your side. The current workaround should not interfere here, and ideally, no additional workaround should be needed, as the block implementation is technically different from the one on the product page.