Perhaps. It’s not clear to me that this is irrelevant to the formal validity of the argument, since “is a typical pig in all respects, and flies” seems to be a contradiction, and replacing a term in an argument with a contradiction isn’t necessarily truth-preserving. But perhaps it is, I don’t know… common sense would reject it, but we’re clearly not operating in the realms of common sense here.
Perhaps. It’s not clear to me that this is irrelevant to the formal validity of the argument, since “is a typical pig in all respects, and flies” seems to be a contradiction, and replacing a term in an argument with a contradiction isn’t necessarily truth-preserving. But perhaps it is, I don’t know… common sense would reject it, but we’re clearly not operating in the realms of common sense here.