>is it false when i use DI instead of Bp
No, di can be used for addressing just as easily as bp. However, it benefits clarity to use the registers that are traditionally expected, and bp is expected as a reference to the stack pointer even if it isn't required. Thats like using bx as a loop counter instead of cx. Readers will pause to wonder why you chose to do something different.
>is it true ??
No. If you're using bx then I'll wager you're working in 16-bit mode rather than 8-bit mode. In that case, the stack is set at 16 bits, no matter what you try to push onto it. So when you decrement di, you're moving it by 16 bits instead of 8, which will give you *two* pushes. Even worse, the first value you push has an indeterminate low byte and the second value has an indeterminate high byte. This would be better: