As salam o aliakum . They on their website said, hadith comming through 30 chains, doesn't include addition of "dollowing ahlebait (عليه السلام)"  thus in few riwayahs its odd and such riwayahs are daef. I will present their 30 chains!   (Chain #1) Zuhayr bin Harb and Shuja ibn Makhlad (wording is Zuhayr’s) — Ibn `Aliyyah (Isma`eel bin Ibrahim) — Abu Hayyan — Yazid bin Hayyan  — Zayd ibn Arqam. [Sahih Muslim, vol 6, page 267 — 268 , #6225(2408)]. (Chain #2) Muhammad bin Bakkar