When people buy, it adds BNB to liquidity pool.

When people sell, it takes BNB out of the liquidity pool.

The only other way to add BNB to the liquidity pool is to add liquidity, but you can track the liquidity pool transactions and see that nobody is adding liquidity except the SafeMoon liquidity injection. Except that, as explained in my article, this liquidity injection doesn't add any *new* BNB to the pool, it first sells into the pool, and then adds back the BNB that it received from the pool, for a net neutral effect on the BNB in the liquidity pool.

So, if BNB in the liquidity pool goes up (as it did -- shown by my screenshots), that means that there were more buyers than sellers.