It definitely lends credibility; versus the introduction from the other comment - that this is the guy that glitter bombs package thieves on youtube - which makes me take this less seriously.
I'd recommend watching those videos before knocking him for the glitter bombs. They are impressively engineered, with entertaining videos which contain a good deal of detail about how, why, and in the most recent version, how they are working with law enforcement to crack down on package thieves.
"Stuff Made Here" is amazing. I can't believe how talented that guy is. And he seems much less edited/fake than Rober (who I also enjoy). I watch both of their videos whenever they upload a new one, but "Stuff Made Here" appeals much more to my engineering side, and I appreciate the lack of "showmanship" that is so prevalent in Rober videos.
Rober cuts to the chase. I think it's tuned for a different audience. "Stuff Made Here" guy is willing to show all of the "wrong turns" on the way to a good design. Rober's audience doesn't get a chance to get bored with one of those wrong turns and change the channel. But "Stuff Made Here" will attract an audience that is curious about the process that got him there.
Those packages are designed incredibly well, IMO. There's a lot of things that can go wrong and he seems to reliably get footage of it being opened and recovers most of the packages, too.