I don't know exactly how they are doing simran at that Gurdwara.
But I'll agree that we all need to be less cult-like.
By that, I mean the idea that "my little Sikh group" is going to Sachkhand and every other Sikh is going to Narak (hell).
A little bit of tolerance for a bit of diversity in Rehras length, etc., would be a good thing.
There are a lot of little groups which think that only they have the secret Nam Simran recipe and no one else even knows about mediation. They're wrong.
Some people will post that the Nihangs are the only Sikh group and all the others are fakes. Even if that's true, the Nihangs fight amongst themselves. So that's cult-like as well.