Hi Arpit Kanodia
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Re your info “several people now murmuring that this DRDO developed Pumpjet will go into [future Indian SSBNs] S3 and S4 - and most probably S5" below.
A simple alleged DRDO designed alleged photo above revealed August 2020 at link
Arpit Kanodia adds “But surprisingly, SSN will still receive normal screwblades.”
Pete Comment: As India's S3 and S4 SSBN designs will likely be completed, launched and commissioned long before India's longterm 2030s SSN is completed, it makes sence that a SSN pumpjet vs propeller choice is left open until the late 2020s.
Arpit Kanodia also supplied this unattributed (though, by implication, DRDOs) undated, PDF document “PUMPJET PROPULSOR AGGREGATE: Objective: Development of Electric Motor to be integrated with the Pump-jet Propulsor to replace conventional propulsor system...” at https://tdf.drdo.gov.in/funding_details/download_document/381 .
Regards
Pete