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That's a typo, Frontier uses the Slingshot network from Cray/HPE. The table below has the correct information.

seems to be a proprietary interconnect that is “Ethernet compatible”

https://www.hpe.com/us/en/compute/hpc/slingshot-interconnect...

As far as I know, Slingshot uses a layer 1 that is exactly the same as Ethernet and allows layer 2 ethernet packets to enter switches. However, it has several layer 1/2 extensions that let it look more like Infiniband to use cases that need it, including flow control and congestion control.

It's wrong, and quite a funny typo. The interconnect is 100 gigabit.

https://www.olcf.ornl.gov/frontier/#4