I agree with both experts. My further observations are as under :-
(i) Sub-contractor is supplying manpower supply service (pure labour service) to Govt. projects for and on behalf of the main contractor (construction company) for construction service.
(ii) Hence main contractor is, de facto, supplier of pure labour service to Govt.
(iii) Manpower supply is not under RCM as per relevant notification as amended from time to time.
(iv) Pure labour service is exempted vide Notification no.12/17-CT(R) dated 28.6.17 as amended from time to time up to 18.11.21. (serial nos.3 & 10 refer).
(v) Govt. Authority and Govt. entity both have been excluded from the definition of Govt. for the purpose of exemption from GST w.e.f. 1.1.22 vide Notification no.16/21-CT(R) dated 18.11.21 effective from 1.1.22.
(vi) In this scenario, the construction company (main contractor) is not a promoter as per definition of 'promoter' under Section 2(zk) of RERA, 2016 adapted vide Notification No.11/17-CT(R) dated 28.6.17 as amended (clause (xvii) of paragraph 4 .refers) inasmuch as pure labour service is involved. Hence no question of RCM on this ground also.