Most certainly pure. Being based mostly on a bat coronavirus wouldn’t be fascinating for a bioweapon. You’ll select one thing that already has a transparent an infection path in the direction of people and possibly with low mutation charge. Not an unusual pressure that must be severely altered earlier than it may even infect people.
Bats particularly have a really robust immune system that reacts a lot faster than most animals (and people) in the direction of new viruses. So if a virus that efficiently infects a bat randomly mutates into one that may infect people it will probably wreak severe havoc.
It would really feel like one thing this severe have to be human made however in follow it is a mixture of tens of tens of millions completely different mixtures of all types of viruses as folks have eaten bizarre ass meals with out even correctly cooking it. Kinda like evolution works – you see the ultimate merchandise (like bats with their sonar, birds with purposeful wings, chameleons with potential to alter shade) and it may appear excellent and “designed” on goal however that is as a result of you have not seen 1000’s of failed iterations over numerous generations that got here earlier than it.