I guess he is in a better place than you to have the idea about what he says-
He is doing a constrictive criticism in a polite manner-- the issues highlighted are valid- and DRDO rather than a marketing agency should focus more on the hard work as some other agencies like the ISRO for example- or BARC-
Coming to the propellant part- for anti-ballistic missile to be economically feasible its cost should be a fraction of the missile it intercepts- the lesser the better- you cannot have a A4/A3 intercepting a Shaheen 2 or any other missile for that matter- the cost would be extremely high as for each shaheen you would have 20 or so(take the number as an example the actual number can only be assumed after doing mathematical calculations)
interceptors waiting since you cannot predict its path and prepare with say a couple of interceptors and also there are a number of targets it can take-
Hence the missile has to be economical hence smaller size-higher speed-better propellant required-
Buying a BMD is not a solution every one knows that-
This is Pravin Sawheny you are talking about, a long time DRDO baiter, wrong on multiple counts when it comes to anything technology related, and lets just say, not a neutral person by any means when it comes to pushing certain POVs.
Also, he is not a serving IA officer (thank goodness for small mercies). For several reasons, he is no longer there & runs the Force newsmagazine, which, lets just say, is not exactly a paragon of objective coverage.
In short, I wouldn't even waste time trying to dissect his arguments because even a cursory glance shows his bias & lack of objectivity combined with shoddy research making a mockery out of his claims.
For instance - "slow speed Prithvi". Apparently, DRDO is so stupid that it did not modify the Prithvi to be a representative target. Perhaps they call it Prithvi Target missile just for kicks.
In short, all these claims of his of DRDO being a marketing agency etc are his own bias & fervent imagination. The BMD system is not a DRDO initiative but a GOI one, sparked off by the lack of a BMD cover during Op Parakram. But never mind, Sawheny will find some yarn to spin.
PS: One year before Akash trials & subsequent mass orders, he was calling it a failed system which would not see service.
PPS: A year or so before Pinaka went into production, he was calling it a failure as well.