Confused about the definition of point to point ,this point means single antenna or single device?
Point to point typically refers to single devices transmitting to each other, regardless of how many antennas they have. The important thing is that in point to point systems, there is no interference from other transmissions, you only have signal and noise. 

If transmitter and receiver have multiple antennas, you would typically call it MIMO, to specify even further, the terms single user MIMO (SU-MIMO) or point to point MIMO (P2P-MIMO) are not uncommon. 

If only one antenna is used for data and the others for harvesting energy, it depends on your viewpoint. If it makes sense to treat these antennas separately, i.e., ignoring the energy harvesting antennas when designing the communication link, there might be a point to call it MISO. I would assume that one also optimizes the energy transfer so that all antennas are looked at jointly. This would advocate for calling it MIMO.

*edit: Regarding the scenario you edited in later: As Blackmath correctly said, this is a classical interference channel. So it's not a point to point setup. It's also not Point to Multipoint, in which the same information is broadcast to several users. Not so in your setup as you have different intended pieces of information for your two receivers. This is an interference channel.