Read up on Sufis from a Sufi:
https://iamheart.org/about_iam/sufism.shtml
I read it and it's sort of interesting. That being said, I get the notion that the author is trying to minimize the fecklessness of so-called "peaceful Islam" in general and trying to represent Sufi Islam as some sort of main-stream esoteric, advanced, all-inclusive doctrine of syncretism. It's not. It's far closer to a doctrinaire muzz fundamentalism which is utterly and absolutely intolerant of modification or adulteration in any way.
That rigid inflexibility is what results in the xenophobic refusal of the jihadists to tolerate any compromise or collaboration with people who do not believe as they do and furthermore their willingness to commit the most heinous murderous atrocities to preserve this imagined "purity" PTUI!! Daesh!
The reference to Muslim Sufism accepting Vedantism is utterly laughable. The overwhelming view of the most powerful muzz clerics is that Vedantists (Hindus) are contemptible infidel animals worthy only of subjugation or slaughter because they are pantheists (believers in the existence of more than one God).
There are some Muslims such as the sort that Malcom X was, who have very civilized values and who are mostly non-violent. It is perhaps notable that Malcom X was assassinated by other Muslims.
Let's be frank, any strong influence by self-described peaceful, non-militant Sufi sects in the greater movement of Islam (and its more than 1 billion adherents) has been utterly and completely marginalized/suppressed by the Salafist/Wahabbi and Twelver sects who flatly do not tolerate any ideological movement within Islam that seeks to marginalize or harshly criticize jihad as an external, wholly-physical waging of actual wars of aggression in which mass murder is the product.
There is no significant "reform" movement in greater Islam. The best the non-militant factions can do is maintain some marginal influence over the greater religion and hope that they can individually avoid becoming targets themselves for the militant members who dominate and control it.