A lot of people who go to Cuban nights (because that's what they dance and/or that's all that's on offer) have told me that they find it boring hearing timba, timbatón and reggaetón all night. They would much rather have some romántica in the mix - and that would make the night more authentically Cuban in some respects.
Rey Ruiz being from Cuba doesn't make his sound any more authentic in terms of music choice. He is a data point for sure, but we should take into account that his target audience is linear dancers! Meanwhile, Mayimbe and Calle Real are not from Cuba but make music for dancers of this style.
My point was this: I put him in the "Salsa from Cuba" because this is clearly where he belongs, music geared toward the linear/Miami traditions. And while I'm glad so many people here like to dance to it, it's just not good for casino and I don't think casineros would enjoy widening their repertoire for music that clearly doesn't fit their dancing style.