It's correct for each of cabextract, xfonts-utils, and defoma to be Multi-Arch: foreign, because each provides an architecture-independent executable interface. But there's no need for them to be tagged in order to fix this issue - *only* the ttf-mscorefonts-installer package needs to be tagged Multi-Arch: foreign, because it's the only package which is a direct dependency of the foreign-architecture package.
It's correct for each of cabextract, xfonts-utils, and defoma to be Multi-Arch: foreign, because each provides an architecture- independent executable interface. But there's no need for them to be tagged in order to fix this issue - *only* the ttf-mscorefonts -installer package needs to be tagged Multi-Arch: foreign, because it's the only package which is a direct dependency of the foreign- architecture package.