Also, they're seedless grapes. Planting them would be kind of pointless.
Second, if they didn't, that would be entirely pointless.
Us grape growers propagate these vines from clones. Breeders who work with seedless grapes have some horomonal techniques that can get a vine to produce some % of potentially viable seeds. Or one parent in the cross is a seeded variety and the seedless grape is just the pollen source.
Also a skilled botanist can turn it into a tissue culture and propagate it.
Dealing with plant cells seems a lot easier because you don’t have to conmpete with spores floating all around.
You could buy a certified clean room that’s inspected for $20k. Or build your own for a few hundred bucks.