Classification of Polytonic Greek in Material Design Language Support

I stumbled in this website:

and encountered classifications of script systems:
English-like (e.g. LGC with the exception of Vietnamese), Tall (Indic, Semitic) and Dense (CJKV).

In the Polytonic Greek by Irene Vlachou:

I saw forms that look very similar to positioning in Latin script for Vietnamese, especially for the iota subscript and the nặng tone marker for Vietnamese.

(Image by 
Đường Phú Hiệp)

(Image by Irene Vlachou)

Would it be valid to classify Polytonic Greek as a tall script system using these examples, or are there any other subtleties here to take into consideration?