What is the meaning of "no dispute on/about the Hajj"?

Imām Ibn al-Jawzī (d. 597/1201) summarized the scholars' opinions in his book "Zād al-Masīr" as follows:

1. It means that no one should argue with another to the extent that it leads to anger and behavior inappropriate for Hajj. [Ibn ʿUmar, Ibn ʿAbbās, Ṭāwūs, ʿAṭāʾ, ʿIkrimah, al-Nakhaʿī, Qatādah, al-Zuhrī, al-Ḍaḥḥāk]
2. It means that there should be no doubt or dispute regarding Hajj, as its rules have been established, its time is known, and any confusion caused by the practice of intercalation has been eliminated. Mujāhid states: They performed Hajj in Dhū al-Ḥijjah for two years, then in Muḥarram for two years, and then in Ṣafar for two years. They performed Hajj in every month for two years until it happened that Abū Bakr's Hajj coincided with the second year of performing Hajj in Dhū al-Qaʿdah, a year before the Prophet's (ﷺ) Hajj. Then the Prophet performed Hajj in the following year in Dhū al-Ḥijjah. It was then that he said, "Time has returned to its original state as it was on the day Allah created the heavens and the earth." (Bukhārī & Muslim) [Al-Suddī from his teachers; al-Qāsim b. Muḥammad]