COMMENT: The comparison is quite plausible phonetically and semantically. The only problem is the vowel -o- in PTsKh ( < PTs *-ɔ-); however, the word is attested only in Khvarsh. and Inkh., and thus a reconstruction of PTs *ɨ or *ǝ is also not absolutely excluded (a regular reflex would be PTs *χ:ɨr).
