Gina definetely can see Rayman, you should check out the previous chapters. She asked who's this or she glanced at Rayman when he was interupting the flow of conversation.
Fiona and the gangs time travelled into the late/last stage of Rayman's journey (or maybe he still has couple of time turner magic slots left). Just a couple of years before Albus awaken for the first time.
If only this series have enough sales popularity and make it through top 50s or something, I'm sure it can be more than just a mere 'Novel's ads' 😔.
Like those popular manga's adaptation with hundred's of chapters and strong sales..