Many Google voices disappeared lately, including Spanish and other language male voices.
People blame me and @Voice app for a very bad decision that Google made: removing many voices from their Android Google Text-to-speech product. Spanish voices from many regions, and particularly male voices, disappeared, and many more similar problems. One user sent me this link, to download that latest Google TTS APK file that still has the now removed voices. Here is that link: https://www.apkmirror.com...apk-download/download/
If you install this older version (version number 184.108.40.2065969528 (210316003)), then you should also disable automatic updates for Google Text-to-speech product in Google Play store. Otherwise they will "upgrade" your Google TTS copy again and remove the voices you like.
To avoid such (and many more) unpleasant surprises from Google, consider using the excellent voices from Vocalizer TTS, Acapela TTS or many other alternatives found in Google Play store.