That’s not a stab at fathers. It’s a stab at the societal norms that force single mothers to work double shifts just to support their family. They are purporting that this is due to the fact that our society is patriarchal (run by men - which it is). Whether they’re right or wrong it’s not a dig at traditional dads.
They’re attacking the societal norms that a straight cis mom and straight cis dad are the only foundational units for a legitimate family.