The blanket statement “Never talk to the police” is obviously either not very well-thought-out or not meant to be precise. What if you're the victim of a crime? A more honest title for this video would be “Talking to the police will only make you more likely to be convicted of a crime”. An infinitely-selfish person might interpret that as “Never talk to the police” (although even that interpretation has its weaknesses), but a reasonable, respectable person should consider the positive consequences of talking to the police and weigh them with the possibility that they will end up being wrongly convicted of a crime.
If you're innocent and have information that could potentially help stop a criminal from committing more crimes (as in OP's case, assuming his story is true), I think that in most cases it's totally reasonable to talk to the police, since the benefit to society would almost always outweigh the small possibility of being wrongly convicted of a crime. If you know that you're suspected of a crime, or that the police are likely to suspect you of a crime after you give them information (as OP potentially could have foreseen), then the question gets harder. Even when you know that you're suspected of a crime, I still think "Never talk to the police" is often overly-selfish, depending on the circumstances.
When you are the victim may be the only exception; police everywhere is "overly-selfish" in the sense that they score by getting criminals; meaning anyone perceived as such by most judging figures.
If you're innocent and have information that could potentially help stop a criminal from committing more crimes (as in OP's case, assuming his story is true), I think that in most cases it's totally reasonable to talk to the police, since the benefit to society would almost always outweigh the small possibility of being wrongly convicted of a crime. If you know that you're suspected of a crime, or that the police are likely to suspect you of a crime after you give them information (as OP potentially could have foreseen), then the question gets harder. Even when you know that you're suspected of a crime, I still think "Never talk to the police" is often overly-selfish, depending on the circumstances.