Brother, your understanding of COMCASA is slightly flawed. This is what it actually is:
September 06, 2018
1. It is one of the three foundational defence pacts that needs to be signed by a country in order to obtain high-tech military hardware from the US. Before COMCASA, India had signed only one of these agreements – Logistics Exchange Memorandum of Agreement (LEMOA) – in 2016. The two countries are yet to begin talks on the third agreement – Basic Exchange and Cooperation Agreement for Geo-spatial Cooperation (BECA).
2. The agreement will give Indian military access to function on high-end secured and encrypted communication equipment which are installed on American platforms obtained by Indian Armed Forces. These platforms include C-130 J, C-17, P-8I aircraft, and Apache and Chinook helicopters.
3. The act is usually known as the Communication and Information on Security Memorandum of Agreement (CISMOA). But, it was changed to COMCASA to signify its India-specific alterations.
4. It will also provide a legal framework for the transfer of encrypted communication security equipment from the US to India. It is believed to be safer and more secure than the system that India uses right now. “Signing of Communications Compatibility and Security Agreement (COMCASA) will enable India to access advanced technologies from USA,” Defence Minister Nirmala Sitharaman said while addressing the media.
5. The agreement was pending for almost ten years. One of the major reasons for this was the fear that India may compromise its operational independence. Critics had also pointed out that the agreement could jeopardise India’s established military ties with Russia and access to their weapons systems.
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Now to address the PAF Blk 70 & 72's
Blk 70's - new built 36~40, of which 6 have been guilt are on hold, due to financing issues.
Blk72's EDA - Total 15 as of now. Of which 4 have been built, and undergoing testing.