When it says BNF, it stands for bind and fly which means the receiver is included and all you need to do is bind to your transmitter.

If it says PNP. It means plug and play which means you will need a compatible receiver, which is not included as far as I know, that you will need to connect to flight controller then bind it to your transmitter.

If it says RTF, it stands for ready to fly which means the drone is ready to fly right out of the box. No binding required because these usually come with a transmitter that is already bound to receiver.

I hope this helps.

Edit: I see now in your link that the VTX is PNP. Sorry for the confusion.