Pereskia grandiflora :: Dattaji Salvi Udyan :: 05 MAY 18 : 4 posts by 2 authors. 2 images.
Dattaji Salvi Udyan  Thane
Date: May 5, 2018 … Altitude: about 11 m (36 feet) asl
Pereskia grandiflora  Pfeiff.

You could be correct … But every link in your list has flowers and leaves in focus. In my posted pictures, stems are in focus, most probably very young plant – yet to assume the dense foliage. One of your links – third among last, does show the typical cluster of spines as seen in my posted pictures. I hope someone validates in positive / negative, else we will have to wait until the posted plant blooms in the garden.