The real answer is that its copywriting, which means grammar is nearly irrelevant. He starts with "Hey I'm Chris Sev" because it's a better headline, which is

The real answer is that its copywriting, which means grammar is nearly irrelevant. He starts with "Hey I'm Chris Sev" because it's a better headline, which is defined as something that is more likely to make people read the rest of the page. (Defined specifically because I see lots of complaints here that headlines should be descriptive of the actual content, which isn't really what matters, functionally. (I get the impulse though, really.))