Does the DEC/BUSD liquidity pool still counted when computing for the SPS airdrop?
Sure. It is counted. No special steps required when put the DEC and BUSD in Cub Finance liquidity pool but check you have linked your BSC wallet address in Splinterlands - click your login then "Link External Wallet".
Uniswap (Ethereum) DEC-ETH pool also counted in SPS airdrop but I prefer to put DEC into Cub Finance due to low transaction fees in BSC network and additional 20% APR for farming CUB tokens in this pool.
RE: Splinterlands: How to make 100x profit in 100 days only with starting 10$ investment. DEC/SPS Math Algorithm.