This is because the Short-falling Shi'a (al-Shi'a al-Muqassira) acknowledge, confess, and profess that the 'Great News' is Ali ibn Abi Talib, and that he is the 'Gate of Needs' (Bab al-Hawa'ij) leading to Allah the Exalted.

The Monotheists [Alawites/Khasibiyya], however, believe that the 'Great News' is our Master, the Anza' al-Batin (Ali).

The Delegationists (al-Mufawwida) believe and profess that the 'Great News' is the 'Name of Allah,' His 'Veil,' His 'Side' (Janb), His 'Flank,' His 'Attentive Ear,' and His 'Speaking Tongue.'

This school of thought [Delegationism] is the closest of all schools to Pure Monotheism (al-Tawhid al-Mahd). It is from this school that the believing man, who is veiled from Gnosis, ascends to the 'Great Path' (al-Muhajja al-'Uzma), the Gnosis of the Most High, and the affirmation of Him. May Allah keep us and all believers firm in the 'Firm Word.'

As for this 'croaker's' attribution of Extremism (Ghuluw) to himself and his pride in it—and that people charge him with Extremism and his repetition of the word 'Extremism' in this poem—it is because the people who attributed Extremism to him are the aforementioned Short-falling Shi'a and those of a lower rank of Short-falling.