Also, in "The Robot Revolution", Belinda asks the Doctor "Is this your TARDIS?" without three doctor mentioning the word TARDIS.

I would say she is Mundy Flynn because no one's genetics, no matter how closely or distantly related, is an "absolute match".

You can tell the article's author used AI assistance. RTD's quote is near incomprehensible. Stop using shortcuts. Do the work yourself. You're supposed to be a journalist.