It is certainly possible that the Jamaat-ul-Ahrar faction of the TTP launched the Peshawar mosque suicide attack without the knowledge and approval of its parent organization.

Source: https://www.longwarjournal.org/archives/2023/01/pakistani-taliban-kills-scores-in-mosque-bombing-in-peshawar.php?utm_source=rss&utm_medium=rss&utm_campaign=pakistani-taliban-kills-scores-in-mosque-bombing-in-peshawar

Jamaat-ul-Ahrar may have made the announcement at the behest of Mufti Noor Wali Mehsud, the 4th emir of the Pakistani Taliban.

Source: https://themedialine.org/top-stories/pakistani-taliban-splinter-group-claims-responsibility-for-mosque-bombing-as-death-toll-hits-100/?utm_source=rss&utm_medium=rss&utm_campaign=pakistani-taliban-splinter-group-claims-responsibility-for-mosque-bombing-as-