the only way to know 100 % is to grow the seed out to see, if it is a myth than you will know, its just a few pots and some nutrients, some times good gambles pay off
would i grow them? why not is what you should be asking yourself. just grow them.
Hey that plant is going full hermie. You can try and carefully remove the places where it is or get the whole plant so it won’t ruin the rest of your girls. Just don’t shake the plant and put a bag over it so no pollen goes anywhere
Happy growing