I think that’s a misreading of one statement, I think in context he’s communicating, the president cannot pass laws. He’s done everything he can within the powers of the executive branch to support reproductive rights. Without a congress that is willing to pass a law he can sign (including senators willing to overturn the filibuster), there is not much more he can do at this point.
I guess you could say maybe he could veto all legislation unless they pass something codifying Roe v Wade? But I think that would backfire, as people begin suffering from massive government shutdowns and a few people just splinter to start voting with Republicans to over ride the vetos and effectively the Republicans are in control now and Roe v Wade still isn’t codified.
In the end Biden is right, at least with this form of government and this Supreme Court, a pro choice president isn’t enough no matter how ferverent (though I would argue Biden has been the most ardent pro choice president there’s ever been). We need a pro choice congress too, and senators with the courage to scrap the filibuster to protect a fundamental right and pass a law. Or a congress that is willing to pass a bill to expand the supreme court. It’s just not something the president can do on his/her own.