Is there missing punctuation in that headline or am I an idiot?

No, there is no punctuation missing, the headline writing style is just hurting comprehensibility. I’ll expand it a bit.

“A startup, which is set to brick an $800 kids’ robot, is trying to open-source it first”

Cheers, I can read and comprehend the original headline now. I’m Australian so English isn’t my first language, at least that’s my excuse.