As far as I know, Zephrys gives silence for minions with keywords, such as Taunt, Divine Shield, etc. But not card text.
Official word to that effect:
https://twitter.com/Celestalon/status/1156634915896774658
https://twitter.com/Celestalon/status/1160250573767110656
Also from the forums:
Especially this part:
As a rule, we don’t plan to teach Zephrys about individual card mechanics and interactions. However, we’ve made a one-time exception
Edit: If you want to learn more about what we know Zephrys will or will not do, have a look at a page like this one:
https://hearthstone.gamepedia.com/Zephrys_the_Great