I looked at this promotional video and it says that the course if 3 hours for free. In my book, nothing is free. The first page asked for your information, including mailing address, and you have to check boxes agreeing to receive promotional materials, I believe. So, in essence, they are trying to build their data base for future promotions.
What they are promising is how to learn to fly your
Mavic 2 Air. But you can easily pick and choose from many free You Tubes, which is the way most of us learn. It's your call if you want to be put on a promo mailing list for future sales promos.