Do you have evidence of that? To claim such you'd need to know what Apple's margins are only on iPhones before and after removing the charger. You'd also need to distinguish what comes from the charger and what comes from modified packaging. You'd also have to factor in changes in worldwide tariffs, supply chain issues, and more. Then factor in inflation. It's also possible Apple would have raised iPhone base prices if it included a charger and by not including a charger, Apple kept prices the same, which is an effective reduction.
None of what I wrote means your statement is necessarily inaccurate. All I'm pointing out is that your claim needs evidence to support it. That evidence is not possible to obtain without being a high-level Apple "insider", or at least have access to internal financial documents.