IANAL, but scrollkit appears to actually be a startup (judging from their about page), meaning that the video was more along the lines of a demonstration video of a product or even a advertisement than an educational video.
My understanding of the rational for "fair use" is use for the benefit of the public good and explicitly not for the commercial purposes, this seems to me to be very commercial.
Look at the actual definition of fair use. There is no requirement that the use be non-commercial, only criteria that include whether or not the use was commercial.
My understanding of the rational for "fair use" is use for the benefit of the public good and explicitly not for the commercial purposes, this seems to me to be very commercial.