That's not been my observation since 1/4. AIT was in use at JAX, MCO, and SFO when I went through. In fact the elite lines I used at JAX and SFO are pointed directly at lanes with AIT, and plenty of passengers (but not airline or airport employees) were being directed through them. I opted out in SFO and again in JAX.

I didn't see any at the LGA Delta checkpoint.