Have seen it before. Looks like basics made overly complicated. Shen Jiazhen was a Chen style teacher, so this should be the very basic requirements for Chen style form practice.
Taijiquan today is mostly about form, form, form. Eight unique features of Taijiquan? Maybe "eight unique features of Modern Chen style Taijiquan Large Frame form practice" would be more adequate? The long overly complicated name would match its substance.