You can create a AbstractDataclass class which guarantees this behaviour, and you can use this every time you have a situation like the one you described.

@dataclass 
class AbstractDataclass(ABC): 
    def __new__(cls, *args, **kwargs): 
        if cls == AbstractDataclass or cls.__bases__[0] == AbstractDataclass: 
            raise TypeError("Cannot instantiate abstract class.") 
        return super().__new__(cls)

So, if Identifier inherits from AbstractDataclass instead of from ABC directly, modifying the __post_init__ will not be needed.

@dataclass
class Identifier(AbstractDataclass):
    sub_tokens: List[str]

    @staticmethod
    def from_sub_tokens(sub_tokens):
        return SimpleIdentifier(sub_tokens) if len(sub_tokens) == 1 else CompoundIdentifier(sub_tokens)


@dataclass
class SimpleIdentifier(Identifier):
    pass


@dataclass
class CompoundIdentifier(Identifier):
    pass

Instantiating Identifier will raise TypeError but not instantiating SimpleIdentifier or CompountIdentifier. And the AbstractDataclass can be re-used in other parts of the code.