All,
I outlined on Gallifrey Base some time ago how I think this mutated from a list of titles I created for the DW production office of what could potentially be still out there(around the time Air Lock and Underwater Menace were returned) to a mixed bag of 44 episodes or thereabouts, to the bizarre figure of 90, which is a new one on me.
That initial 'chinese whispers' rumour just got repeated and embellished and when you want to believe and every Tom, Dick and Harry has a theory, then this is what you get.
People have been wondering why I didn't step in sooner and "nip it in the bud". Well, I have better things to do with my time than repeat myself on a DW forum. People wouldn't believe me anyway.
People know that I believe it when I see it. Here's a new one; if it sounds too good to be true, then it probably is.