12er Claim Imams did Taqiyyah during Imam Zayd's (as) revolt?

Here is a article which states the Imams did Taqiyyah during Imam Zayd's (as) revolt. In another they supposedly did not declare their Imamate.

Despite all the Infallibles’ support for Zayd and their emphasis on his character, they did not back him openly because Zayd’s uprising had to occur prudently while taking all precautions. The enemies might have heard about the Imam’s intervention and his agreement with Zayd’s uprising. Neither the Imam and Zayd nor his close companions wanted anybody to be informed about it. (A Biography of Imam Ja‘far al- A Biography of Imam Ja‘far al-Sadiq (a) by Muhammad Nasir Husayni ‘Ala’i , Pg 57-58)