Yip Man taught Kwan Sau in biu gee to his Foshan students. The only Hong Kong student that had it in their 3rd form was William Cheung. Leung Ting added it to his Biu Jee in the early 2000's late 1990's after learning how Lun Gai performed his Biu Jee. That's why your Leung Ting video doesn't show Leung Ting performing it.
As a whole some wing chun families have it in Biu Jee but most don't. Many on the mainland don't have the Biu section but some do. Forms vary.