One of the founders here! No it's not. The max video length is up to 2 min, which is also the case in any non-free tier. We just include a 15-second option for that tier (because people it need for things like FB ads)
Given that the next tier up is "Create longer/more detailed video (up to 4 min long)", I'd guess you are right.
Seems like this is pretty useless unless you pay 200$ per month. Which may be a reasonable number for the clearly commercial / enterprise use case, but I'm just not certain what you can do wtih the lower tiers.
