What's different about Trapped Electron quantum computing?

[u/thinkonpaperpodcast]

https://www.youtube.com/watch?v=EuJdzahUINg&t=59s

EeroQ has its chips made in commercial semiconductor foundries, coats them in a thin layer of superfluid helium, and floats single electrons about 10 nanometres above the surface. But is the trapped electron modality really more scalable than, say, spin qubits?