What I think Kubo was trying to say was if the past was labeled as C1, Tsukishima could go into Orihime's past and change it to C2. Orihime now came from C2 instead of the main C1. So he keeps putting people into this C2 past while Ichigo is in the main timeline.
All of this seems like super huge bullshit on the time travel scale though. It still all seems like it might as well be memories. It probably sounded too much like Aizen so he changed the wording