That is what he said. Perhaps he meant that it is acceptable as corroborating evidence, for Ali ibn Zayd—namely Ibn Jud'an—is weak, though he may be cited for corroboration.
The hadith under discussion was also reported by Abu Ya'la in his Musnad (6/119/3392), through Abu Ubaydah [al-Haddad], from Muhtasib, from Thabit, from Anas, with this wording. He added to both halves: “The blood-money for each one of them is twelve thousand.” Through Abu Ya'la and others, Ibn Adi also reported it in al-Kamil (6/466), in the biographical notice on this Muhtasib—Muhtasib ibn Abd al-Rahman al-Basri, Abu A'idh—and said: “He narrates from Thabit hadiths that are not preserved.” Al-Dhahabi said in al-Mughni: “He has rejected reports.” I say: This addition is one such rejected report.
Yazid al-Raqqashi also added it to the first half through Mu'alla ibn Ziyad, from him. It was reported by Abu Ya'la (7/128–129 and 154), and by Ibn al-Sunni from him and from others (216/664), as well as by al-Tabarani in al-Du'a (1879) and al-Bayhaqi (563). In the first cited location in Abu Ya'la, “al-Mu'alla” has been corrupted into “al-Haql”—an error which the commentator mistakenly considered correct! Yazid, who is Ibn Aban, is weak.
The first half also has another chain, narrated by Abd al-Mu'min ibn Salim: “Sulayman al-Taymi narrated to us, from Anas,” with this wording. Abu Nu'aym reported it in al-Hilyah (3/35) and Akhbar Asbahan (1/200).