Yes, it is biased Shi'a POV pushing. I am well aware of the different contradictory versions of the last sermon and other contradictory hadith that Shi'a and Sunni use to justify their beliefs. These arguments do not belong in this article. The article simply describes in a few words both the Sunni and Shi'a belief, as it describes in a few words the Satanic Verses incidence. The stuff that you are trying to insert to push Shi'a POV  doesn't belong in the article. Wikipedia is not the place to push Shi'a POV, apologetics, and propaganda