I'm not giving the video any clicks.
It's almost always a better deal to buy a bike as a package deal. Often for tier 1 or 2 groupsets it's like buying the groupset at retail & getting a free frame & having it pre-assembled to boot.
Smart money then sells the frame set to offset the cost & puts the groupset on whatever happens to be their favorite bike.
It's not an unheard of strategy: "I ride a 58 & I want an Ultegra groupset...Oh, look! A size 47 with Ultegra on sale. Oh happy days!"
It's how Mrs. Base2 got her Salsa frameset.