Riot actually confirmed this to be the case.
Their entire goal when creating a match making system was to achieve maximum equality of outcome. They considered it a feature, that the match making system should rig each game, such that there was always a 50/50 chance of a win/loss. They thought that meant it was as fair as it could be.
Obviously, the opposite is true. A fair system would be one that tries to match you with like skilled players and which pits you against like skilled players, not to simply rig each game such that your chances of winning are always 50/50.
That's not the same thing.
But what do you expect from a company who thinks that it's perfectly OK to change their company focus to "fostering diversity and inclusion".
This is only one of the reasons why everyone in the community needs to be very concerned with the direction Riot is going, or League will simply die.