A medieval discussion

I would like to hear the thoughts of tuning list members on the
following question:

Why does Safiuddin Urmavi describe a 17-tone Pythagorean Abjad scale
when, at the same time, mentioning tetrachordal divisions involving
middle seconds (characterized by high-prime limit RI) and Ud finger
positions as given below?

FRET CENT RATIO
A Mutlak 0 1/1
B Mücenneb-i Sebbabe (zaid) 90 256/243
C Half tanini (Mücenneb-i Sebbabe) 99 18/17
C Mücenneb-i Sebbabe (Fars vusta) 145 162/149
C Mücenneb-i Sebbabe (Zelzel vusta) 168 54/49
D Sebbabe 204 9/8
h Mücenneb-i (qadim) vusta 294 32/27
V Fars vusta 303 81/68
V Zelzel vusta 355 27/22
Z Bınsır 408 81/64
H Hınsır 498 4/3

Oz.