I feel like this is something that should be caught based on the context of the chapter, because the characters would then either assume that A is true, or debate B. Unless that's part of the cliffhanger, and there is no more context.
But in any case, MTL in the hands of a "translator" that knows the basics of japanese grammar will often result in a decent translation, and there are some groups that don't do MTL but also don't have a PR and have shit quality. The MTL hate for me is mostly ridiculous when people read the full chapter with no issues, then hate on it because the credits said it's MTL, even if they didn't realize it.