That's not really the point though right? It means that pulling and using containers that are destined for x86 will require also building arm64 versions. Good news is buildx has the ability to build arm64 on x86, bad news is people will need to double up their build steps, or move to arm in production.
W/o rossetta i can't build x86_64 images anymore. Today i can setup OrbStack amd64 linux and build native amd64 images on my mac to put on my servers.
What they talk about is Rosetta's macOS frameworks compiled for Intel being kept around (which macOS Intel apps use, like if you run some old <xxx>.app that's not available for Apple Silicon).
The low-level Rosetta as a translation layer (which is what containers use) will be kept, and they will even keep it for Intel games, as they say in the OP.