My child's school was online-only instruction from March to June, and reopened in September 2020 for in-person instruction. They did not miss one day of instruction. No idea what you're talking about.
A lot of schools remained remote in fall 2020 - depended on the school, and it's not exactly easy to switch between districts. Also, the quality of instruction in spring 2020 was absolutely affected as teachers adapted to remote and everyone dealt with the general chaos. Again could vary by school, but I think saying no instruction was missed is naive. "Days in class" is a horrible metric for learning, and there absolutely were classrooms where quality of learning degraded.
It was a shitty situation all around, and I'm definitely not arguing that schools should have remained open that spring. But it's silly to pretend that education was not affected across the country by the switch to remote.
