Agreed, the exposure criteria is super vague so I’d probably try to be even more thorough on establishing a timeline and frequency/intensity of behavioral and emotional changes that’s directly attributable to trauma exposure (versus other MH and psychosocial factors).
The vast majority of people exposed to traumatic things don’t develop PTSD (I feel like I’ve heard numbers like 80% thrown around?), even if they find themselves troubled in various by that experience and those memories.