OP here, I wrote another blog post that explains how Swiss Tables work, see https://news.ycombinator.com/item?id=44597562

You do not solve the problem of traceability with packet switching.

Regarding eduroam your comment is incorrect. Most 802.1x auth in universities with eduroam use peap+mschapv2 which is a serious security issue (md4 nt hash). It is way too cumbersome to configure eap-tls and certificates. There are ways to get around it with passpoint/hotspot 2.0 provisionning but this is far from being supported on devices.

Very interesting take on modern 802.1x authentication !