He's also said he would make a Halo game if given the opportunity. Miyamoto is a great man, but his words aren't gold.
And whether or not someone "paved the way for video game mascots" seems subjective.
Not that subjective really though KenithMyGoodSir.
Pac-Mania pretty much gripped the world at one point in the 80s much like Pokemon did in the late 90s, and influenced more and more video game mascots to be created based on just how damn marketable he was. Before his existence there weren't anything as lofty as video game characters, just functional sprites like a triangle that shot lasers or a line that was a paddle. Pac-Man was the trend setter for giving these sprites personalities and character.
Let's not forget each ghost was also programmed to behave in a unique way (at the time revolutionary) which gave them individual quirks actually in-game as well(and not just in a text screen like so many did before)
There were the very first video game cut-scenes in between each round that showed off some personality and character to each of the enemies and Pac-Man himself. He was very much THE first Video game
Character.
Honestly Pac-Man's influence runs far deeper than many here give him credit for, and as such I do feel he deserves the spot more than any other third party not currently included.
Regarding Miyamoto's words; he's stated that Pac-Man is his favourite Video Game character of all time a few times. Even if he's also said a bunch of bizarre crap that's still a big deal considering he created Japan's number one video game character.