ABTA is a trade body and is paid by travel agents. It has no duties or responsibilities to anyone besides its members who are travel agents. Travel agents pay money to ABTA only if they think it's in their financial interest
If asked specific questions about healthcare or how to respond to Covid, ABTA's response would be something on the theme of "Sorry, cannot advise on that, best talk to your GP"
I very much doubt in Q1 2020 it would have chosen to push for all flights to China or the Far East to be stopped, as its members who sell holidays to China would have lost money