Check it yourself.
For every coin: its own engine wallet, and the creator-fee split read back from Solana. Nothing here needs our word for it.
What to check.
Split
50 / 50, locked
The coin's fee-sharing config on pump.fun lists two shareholders, the launcher and the engine wallet, and can't be changed.
Wallet
One per coin
Each coin's engine wallet receives only that coin's share. Its history shows claims in and buys out.
Buys
Five a cycle at most
Each buy is a transaction in the log. Open it on Solscan and read the amount and the wallet that paid.
Tokens
Never sold
Everything the engine buys stays in that coin's engine wallet, so its token balance only goes up.