Semantics on both sides. AFAIK the current scientific/intelligence consensus is the laboratory origin story is deemed as approximately equally as plausible as natural origin. So, ~50%, and "not impossible" is just as, if not more disingenuous and faith-based as "fairly good evidence".
OTOH laboratory origin still doesn't automatically imply fully artificial virus. It could be a rare strain of a natural virus studied at the laboratory, it could be a unique new strain mutated randomly/unintentionally from a natural virus in the course of its study, or it could be a strain purposefully developed to have this sort of nasty properties; unlikely to be an actual, "final product" bio-weapon (because it's not nearly as nasty as these would be) but an intermediate stage.
What can be dismissed pretty readily is purposeful, government-mandated release. Releasing it in home city of the microbiology lab would be outright stupid. The much more likely scenario is plain sloppiness in handling of the material, possibly in connection with shady practices regarding handling of test animals (allegations of lab employees selling post-test bats to the local market instead of proper disposal as biohazard material). One also can't completely exclude a rogue employee releasing the infection on their own, although this is unlikely.