I would say expect the worst with Niantic ALWAYS, then hope for the better. Yes, they are stupid enough, they have showed it in the past sooo many times. So my guess is that they are that incompetent that maybe all the past legendary raids are not counting to Mewtwo invites, maybe we don't even get our badges fixed. I have done around 50 legendary raids too, not spend much money, 10€ + almost all I have saved from previous months, but I think that 50 raids will not ever count towards my medals or my chances of getting a Mewtwo. I really think they will start counting by this week or the week before mewtwo gets released, probably only August.
I have learned the hard way to not expect much with this company, the most recent stupid change for me, Mewtwo nerf before being released.
And yes, I am pretty annoyed, their announcements are getting worse and worse, vague, with no crucial information being said, they are trying to create more hype, but they are so blind that they don't know that the game does not need more hype, we the players and the community create the hype, and a lot of us are mad and confused with the Mewtwo announcement. In a AR where time and location are so important, you can't fail that miserably to explain details on probably the most important announcement since game released, there is not a single player in the world that was not waiting for Mewtwo.