I feel that it will severely hinder the usefulness of the site if we allow questions about everything that some group of Muslims do and some claim to be based on Islam.
The line between questions about practices of some Muslim groups/communities and questions about Islamic practices does not need to be clear cut. However, it is clear that not everything done by Muslims (even if it is claimed to based on Islam) is on-topic here. Let's say a group of Muslims in some part of Toronto walk on the right side of the sidewalk and one of them claims that this is an Islamic practice, would that make asking about it on-topic? Another one might ask "is it an Islamic practice to drink orange juice after tea?". You see where this can lead.
In my opinion, such questions are off-topic unless the person asking the question provides evidence showing it is probable that the claim of being based on Islam's teachings is correct. If something is an Islamic practice and not a cultural one, then it is unlikely to be a local one, and there should be evidence supporting such a claim. When it is not clear that a question is on-topic, the burden of showing the relevance to Islam is on the person asking the question. Simply saying that some Muslim groups do it and claim it be based on Islam is not sufficient.
In this particular case, I think this question falls in the gray area. It should be edited to become more general, such that if in future someone asks a similar question we can easily close that as duplicate of this one.
An improved version of the linked question could be:
Are there Islamic bases for practices like X,Y,... to cure spiritual illness?
or even more generally:
How can I distinguish between a practice carried out by some Muslims which is cultural (though some may claim it is based on Islam) and a practice based on Islam?