True hermaphroditism is called mosaicism and it's possible in the way that bouncing a ball to the moon is. Which is technically possible, but so stastically unlikely that no, it's not possible. Mosaicism is when during embryonic development, something goes wrong in one of the cells which alters its chromosomes, but not wrong enough that it can't undergo mitosis. The result is an adult with two genetic codes. An example you guys might know about is the genetically altered CRISPR babies in China. They were altered to be resistant to HIV and one was born a mosaic, so only some of her cells are resistant to HIV and the rest aren't. True hermaphroditism would be half of Yaniv's cells have XX chromosomes or even just a single X and the others have XY or XXY. If a baby was born like this, they would be snatched up immediately for testing and observation and it probably wouldn't even survive into adulthood because of the conflicting endrocrine systems and probably a million other complications. This is the only scenario that what Yaniv claims could be possible.
We already knew he's a lying faggot tho I just wanted a chance to sperg.
Edit: To clarify, the intersex conditions colloquially reffered to as hermaphroditism are nearly all caused by hormones fucking up development. Not what Yaniv is describing.