I think this violates ITAR. You aren't allowed put a guidance system on a rocket. And even if you were allowed to do it for your own fun/education, you certainly aren't allowed to provide instructions to foreign entities about how it do it.
That's before you even get to ITAR.
Those of us who have seen people get nailed to the wall for having a almost to scale picture of a machinegun part on a piece of metal, or people convicted of possessing rocket launchers because the ATF put an entirely different gun inside of an deactivated tube and claims it is a rocket launcher because the ATF's own gun could fire inside of it, are watching this with our jaws dropped because we've seen that even bad faith representation of intent that were so much looser than this end in serious convictions.
looks at his github see's he is a US college student
Yeah he's likely going to jail.
(Edit: ^f 'itar' brought me straight here)
Between that and playing spot the fed at the local machine gun shoot, I was surprised at just how much attention the state pays to these kind of hobby conventions, but I guess I shouldn't be.