It sounds like they expect everyone to use Snap for 32-bit binaries. This might make sense for very popular apps like Steam, but is bound to break for legacy binaries that won't have any Snaps available.
What's been missing here is the rationale for removing these libraries, though. Glibc, and most other base libraries still support 32-bit intel without any problems. The cost of Ubuntu providing them seems very low here. Since they even use APT still, I suspect they could even reuse the Debian repos for i386!