The Kodokan classifies armlocks according to the position tori adopts while applying them.
As such this lock (sometimes called kannuki-gatame) is indeed a variant of ude-garami, since tori holds uke's arm in place with an "entangled" figure-four position.2
This methodology for classifying armlocks can be seen in the other examples in the same video:
1. Same biomechanics, different names
The Kodokan gives different names to an armbar1 depending on which part of the body tori uses as a fulcrum/to secure the lock, despite them all attacking the same joint in the same direction:
- ude-hishigi-juji-gatame
- ude-hishigi-ude-gatame
- ude-hishigi-hiza-gatame
- ude-hishigi-waki-gatame
2. Different biomechanics, same name
Contrastingly, the Kodokan gives multiple different types of joint-lock (e.g. hyper-extending the elbow, abducting the bent elbow, hyper-rotating the shoulder) the same name, determined by the body parts tori uses to control uke's arm/as a fulcrum for the lock:
- Te-gatame refers to:
- armbars, where uke's arm is held in position with both hands
- hammerlocks, where the shoulder joint is hyper-rotated by holding uke's arm bent against their back with the hands
- bent elbow-locks, secured with only one hand (instead of two in a figure-four position as in ude-garami)
- Ude-hishigi-hiza-gatame refers to both:
- armbars secured with tori's knee
- bent elbow-locks (hyper-abduction) using the knee as a fulcrum
- Ude-hishigi-hara-gatame refers to both:
- armbars applied at the waist
- bent elbow-locks using the waist to trap the joint/as a fulcrum
- Ude-hishigi-sankaku-gatame refers to both:
- armbars applied from a triangle
- bent elbow-locks applied from a triangle
Notes:
1. armbar = straight elbow-lock = hyper-extension of the elbow-joint
2. Given the wide array of joint-locks which fall under the blanket of ude-garami, one may wish to distinguish the variants further with more specific (non-Kodokan) names:
• normal ude-garami (abducts elbow, laterally hyperrotates shoulder)
• reverse ude-garami (adducts elbow, medially hyperrotates shoulder)
• kannuki-gatame (hyperextends elbow)