No, that's some Cola Monster stuff. Cola is a grower not a band. I WISH it was mine. The outdoor videos are from summer 2015 - one of the hottest and driest outdoor grows he's ever experienced.
Been a bunch of sex talk here lately.
Emilya is correct. A feminized seed has no male chromosomes. It is almost always female unless something goes haywire in it's environment,or, you let it get really old past it's harvest point and it goes into a panic and decides it must make a "last ditch effort" to reproduce.
The interesting thing is what I was saying a few pages back about hermaphrodite seeds and how the bag seeds you have are likely the product of asexual (hermaphroditic) reproduction. They are likely to be female but have a hermie "chink" in their genetic pool. It's complicated.
The short answer about feminized seeds is that the exceptions to them being female are very, very rare as RTK pointed out. Plant a feminized seed and you get a female. You don't really worry about it. There are rare "oh shit" occurrences with feminized seed plants. If you have good growing conditions and healthy plants then it's so rare that most of us don't pay it any mind.