Similar experience to your post but over 4 years I lost name attached to those seeds from the same vendor. However I found your post looking for Gigantia which just flowered looking true I think. The spread is wide and the plant as a whole is beautiful. Thinking of cutting one of its two trunks.
It is a problem when buying seeds that have been imported from Thailand - they are not always fresh or viable.
The name matters less, since a seedling is always a new variety anyway, and therefore yours to name!
@ATPDON That is great to hear one of your seedlings has bloomed and look's like it's parent. I would love to see a picture. I can't wait till mine start blooming