Preet and Prem are really back so Prem can propose to Heer. Lalit wasn't really in favor of this, and has kept Prem and Preet busy with work. That's why Prem has gone to Delhi. Preet feels his father is just trying to delay the inevitable, ie, Prem proposing to Heer, thus his remark about the delaying tactics. He sort of said it to himself, plus Meher doesn't know why they're back, so she didn't understand.
oh , btw . i didnt understand "bauji's delaying tactics .." comment by preet .. what did he mean ?