It's not complicated to understand at all.
1) The people that received the lion's share of that economic benefit, are mega wealthy GOP people that hate Biden and will never vote for him. 🤷🏿♂️
2) The people that would have voted for Biden at the highest rates (Black people) would not have voted for him at high enough numbers. Because they were sick of Biden doing things like transferring billions in Covid relief funds to the cops. Because racism. 🤷🏿♂️
3) Most of the economic benefit that did accrue to the Black voters that he needed to win, were because of private sector DEI efforts. When those DEI efforts were attacked by bad faith lies spewed by open racists, Biden did nothing to stop them. The result is that DEI programs are now being cancelled left and right, Black people are being laid off disproportionately, and the few steps towards equity that Black folk managed, are being rolled back. Because racism.
Stop asking for credit for the economy.