1. It is a Barelvi Muslim channel - I have never come across converts being attracted to this particular group, which as far as I am aware, is exclusively Indian and Pakistani. As far as I was aware, converts tend to either join Salafi groups or more traditional Sufi tariqahs.
Agreed.
3. This is the one which struck me the most. All the converts they were parading were very young white boys, probably aged between 14 and 17. Do they always get people that young?
Seems a bit fishy to me! Why are all these boys so young? How much do you think they have actually researched Islam as they claim. Have these boys been conned/exploited?
It sounds like these Barelvis want some white converts to boast about and this is an idea they have come up with, i.e. exploit and groom teenage, white boys to convert to Islam.
Humans are prone to many cognitive biases and it's easy to convince someone something when the circumstances are just right, and they already feel a bit disenfranchised from their own social setting.