Only the EX90 it seems is made in SC, possibly just assembled from parts made in China. All other electric Volvos (including Polestar) are straight from China. Gas models and hybrids are still built in Europe but are being phased out.
Cars don't use modern chips ... They use reliable chips that are built to withstand being in a car for years on end ... They also don't need to be as small as possible so older processes will suffice