If it's a commercial on speed i wouldn't think it is technically a scam, but it seems to be not as good as it seems. You have to pay the agency if you want to take the sponsorship. After you pay the fee you have to promote your sponsor with before and after video reviews of the products that you want.
Seems like they could easily charge you the agency fee and then say your video review isn't good enough, or something along those lines, and then make you pay for the parts.
Here is the agency fee table
$500 Sponsorship Flat Fee = $79
$1,000 Sponsorship 9.9% Agency Fee = $99
$1,500 Sponsorship 8% Agency Fee = $120
$2,000 Sponsorship 7% Agency Fee = $140
$2,500 Sponsorship 6% Agency Fee = $150
$3,000 Sponsorship 5.75% Agency Fee = $172.50
$4,000 Sponsorship 5.25% Agency Fee = $210
$5,000 Sponsorship 4.99% Agency Fee = $249.50
If you have the time to make good videos and work hard at promoting your sponsor it may be worth while to get parts for basically next to nothing, but that's assuming these are good honest people that aren't trying to screw you over.