Because they procured very little last year and were dangerously close to the buffer.
If they did not procure more this year, millions and millions of poor Indians would be under the risk of starving to death if a war or epidemic breaks out, you effin' nutjob.
Even now, they are barely holding the buffer.
That doesn't in anyway prove overall procurement has gone down as you claim.
If you compare it with 2014 for instance all procurement is up along with MSP for all 22/23 crops.