A Vivo executive is now quoted as saying that this Android OEM's former flagship NEX line is indeed to be brought back from the dead. It will apparently follow an annual product cycle, which will resume from the first half of 2022 onward. Nevertheless, leaks for the upcoming top-end X70 series continue apace.
https://www.notebookcheck.net/The-premium-Vivo-NEX-smartphones-are-back-and-will-upgrade-once-a-year.557199.0.html