Depending on the source you read, wireless charging is 75% efficient while wired charging is 85% efficient. MagSafe (the phone kind) should be even more efficient since the magnet focuses charging and so doesn’t create as much heat.

I notice my phone getting hot on normal qi chargers, but not on a MagSafe charger.

i doubt that wireless charging makes any difference on carbon footprint.

In reality it doesn't make any difference at all (especially in comparison to bigger issues) but the numbers do and it's the numbers that will guide the development of low-carbon policies.

Wireless charging has all the components from non-wireless charging, then some extra pieces to handle the wireless parts.

Where are you getting the manufacturing carbon savings to offset the loss of efficiency?

They're not saying it's zero, they're saying it doesn't make a difference.

Phones don't use much power.