This simply isn’t true, across the board they are heavier. Satellite shifter are wonderful, but that’s not a performance metric. Also, fwiw, races have been lost due to shifting power being out and being stuck in a gear. Rigo Uran stands out, a few years back at the Tour.
I’m not a hater, I have some electronic shifting in my stable.
Editing, I was misremembering my gruppo weights, they are on parity.