They clearly knew that, but was joking about the dual meaning of the question mark and mā as in 妈/mother, which is ambiguous when written out in an English comm

They clearly knew that, but was joking about the dual meaning of the question mark and mā as in 妈/mother, which is ambiguous when written out in an English comment where it's not a given why there isn't a tone mark (or whether or not they intent the English 'ma', for that matter).