I think the confusion may be that you commented on freeway safety, whereas the comment you replied to discussed highway safety. Freeways are limited access highways; not all highways are freeways.
https://brilliantmaps.com/wp-content/uploads/big-fast-road.j...
https://www.fhwa.dot.gov/planning/processes/statewide/relate...
The Federal definition of highway is basically any public road.
https://www.ecfr.gov/current/title-26/chapter-I/subchapter-D...
Nobody is cycling on either unless there's dedicated infra anywhere even the slightest bit urban. In rural areas cycling on a limited access road is generally "fine"