فَإِنْ قَدَّمَ الْإِحْرَامَ بِالْحَجِّ عَلَيْهَا جَازَ إِحْرَامُهُ وَانْعَقَدَ حَجًّا
Translation: If he enters Hajj ihram before these months, his ihram is valid and takes effect as Hajj.
This concerns the validity of entering ihram, not permission to perform every Hajj rite before its appointed time. The Hajj-month calendar and the rule on the effectiveness of ihram are distinct.
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Bab al-Tamattu — Forms, Rites, and Rulings of Hajj al-Tamattu
فَإِنْ قَدَّمَ الْإِحْرَامَ بِالْحَجِّ عَلَيْهَا جَازَ إِحْرَامُهُ وَانْعَقَدَ حَجًّا
Translation: If he enters Hajj ihram before these months, his ihram is valid and takes effect as Hajj.
This concerns the validity of entering ihram, not permission to perform every Hajj rite before its appointed time. The Hajj-month calendar and the rule on the effectiveness of ihram are distinct.