This is an unscientific statement and a dangerous one on top of it for the simple fact that Shia/Shi’ism is an umbrella term that encompasses many sects throughout Islamic history, many of whom (although Ahlul-Bid’ah) that without a shadow of a doubt fall within the fold of Islam.
As for Twelver Shias: the discussion amongst the scholars i.e. if they are all to be judged as polytheists or not and to what extent they are excused is not my concern (and it is better to refrain from mass-Takfir than to induldge in it). The truth is that even within a sect of Kufr and Zandaqah like Twelver Imamism you find reformists, reformists who might sill clutch to some unorthodox beliefs, yet they have freed themselves (and actively) fight against all major forms of Ghuluw and Shirk that Twelver Imamism is known for today and which is propagated by their Ayatullats.
I’m in contact with such Shias many of them still loosely ascribe themselves to Tashayyu’ (Shi’ism), however, all of them have understood that Twelver Imamism is a reactionary sect based on Kufr and Ghuluw (excessive veneration of other than Allah) and that the Ahlul-Bayt themselves have never claimed to be infallible guides that were appointed by Allah and His Messenger (ﷺ) and other mainstream Twelver Shia beliefs.
Indeed, labels are not irrelevant, Allah has used labels other than Muslims, for example he gave the chiefs of the Sahabah the honorific titles of ‘Muhajiroon’ and ‘Ansar’. Ahlus-Sunnah is a term known from the early days of Islam, used by the Salaf. However, labels are useless if the carrier opposes what the label stands for. A person who refers to himself as a ‘Shi’i’and stays away from Shirk, abandones calling upon Imams and other Ghuluw is closer to the truth than a person who refers to himself as a ‘Sunni’ yet prays to saints/Awliya and indulges in other deviant.
I’ve written some articles about Shia reformists within Iran. It’s not a new movement, it has been existing even before the Khomeinist Revolution.
Shia reformists are despised by the Twelver Shia clergy of Qom and Najaf for a good reason: they know that one of their own – in fact many of their former staunch adherents – have realised the falsehood that Twelver Shi’ism is; a religion of Kufr, Shirk, Ghuluw, and Zandaqah in the name of Ahlul-Bayt, nothing more and nothing less.
Having said that, I strongly advise all truth-seekers to study the material available on the SHIA REFORMIST BLOG.
May Allah guide us all to the Truth.