Maybe I'm too pessimistic. I hope this happens for Flex! It would be great for us.
I think this is a sales ploy to gain sales on the large cabin airframes.
They drop a few million on a "non refundable" deposit to gain the attention of the wealthy travelers. They buy into large cabin fractional with the intention to buy into the SST. Few years later, the SST never happens , but they already have your business.
Flex/FLOPS doesn't have a large intl presence and you can only truly utilize an SST's capability on oceanic legs.
Just my .02