Squatting less than bodyweight - vertical bar path?

[Amy-in-PHX]

YouTube

I'd appreciate your take on the above video, which is instruction from "Melbourne Strength Culture" and states that if you are lifting less than 1.5 times your bodyweight, a vertical bar path is not feasible because the bar's mass is not a large enough fraction of the total mass of the lifter+barbell system. Is he right? (The video is 5 1/2 minutes long, but not worth watching after 4:24 -- the last minute is advice to keep even pressure through the midfoot during the whole movement.)

[Mark Rippetoe]

Understanding the Master Cue | Mark Rippetoe

Note the date.