Definitely for NVH - the block is also required to form the dead pedal, so it's certainly something that needs to be there. The carpet insulation thickness was also very impressive, I'm not surprised why this car is so quiet.If I had to guess, that foam block is there to quell NVH. Interesting that you noted a sort of odd pedal box. I’m quite a bit shorter than you, but have size 13 feet (I swear, my DNA got confused) and noticed nothing weird about my foot in relation to the pedals. I know this sounds dumb, but did you adjust the seat backwards so your legs weren’t at an awkward angle? The ID.4 seems to have a fair amount of seat travel.
Yup, I even tried a few different pairs of shoes with rounded heels (not pointy like a running shoe) and still felt like my foot was very high on the pedals. Maybe your foot sits further back from the pedals, whereas mine are closer because I might sit closer to the wheel? (I would love it if the wheel came out further) I think I must have really long legs for my height, and tall + large feet makes the problem appear.