You can check history from April 2020 to April 2021 of forigen reserves.The net flow from SBP in 3 years is just $2b in total, including the initial time as compared to $16-18b in the last 2 years of plmn.
You need to learn abit about how central banks work and what its function is. It is maintaining liquidity in forex markets not financing CAD, e.g. balancing out around $300m outflow per month to Afghanistan (an unnatural flow) . The currency REER value is the best indicator if SBP is manipulating market or doing its job.
On top of that, can not force external factors like $500m in defense procurement, around $1b in vaccine imports along with TERF rollout in the last 3 months on just currency alone.
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August was CAD was 1.5 billion and import was 6 billion dollar and services was beyond 900 million dollar in August alone.
Real import of goods were 6.6 billion due Covid vaccine was funded by ADB and WB in August.
The main issue is 1 billion dollar import services and car import growth.