I think it's better for "Heel and Toe" driving, that you don't have to rotate your Foot too much, to be able to push the Throttle Pedal with the Heel.
nice photo! btw Curious article for the use of 4 pedals https://www.mclaren.com/racing/latest-news/mclarenracing/article/mclaren-extra-pedal-3153421/