In the article the Indians claimed that up to 37 people were involved in organising it. That's a pretty massive operation.
You can't just have 10 guys who not only have convinced themselves or other to kill themselves but also people to do a variety of tasks, like: coordinate the movements plan, recruit the other 9, get them to the right places with minimal chance of intercept, make sure none bottle out at the last minute, house them until attack, buy the grenades, etc. etc.
And that's just a list off the top of my head and more pop into it all the time. Like they also need the right clothes to not look odd, make sure they attack schools which are easy to get into, have maps to find the school. I'm sure there's much much more to plan in such an attack.
It's like saying that a special forces attack isn't backed up by a massive logistical operation. If it wasn't they'd be nothing special about them as they'd all be dead.