No - that's from 2020. There's another school district that sent out notices to parents that TS had been at their school from March to November. I was surprised too. It's on this thread, I'll see if I can find it.
I've seen the other letter in the MSM in the past but haven't yet found it today except on FB. It was from District 3. District 20 is from January 2020.
Edited to add: Gannon's stepmom former Widefield School District teacher