>>39870733>>39872039His theory was that the games were using more alchemic symbology and themes as time went on and they were pointing toward some overarching story.
Long story short, everything "all comes together" in Gen 7 with it being the end of an era for pokemon. People took it as him as meaning the games would end there,but he clarified that he was talking about basically a soft reboot, probably signifying the transition from handheld to console which would bring about big changes.
He even predicted that the next games would be console games going back to Kanto. And seeing how Sword and Shield are doing things differently in ways that Game Freak plans to do in the future, he was kind of right.
Whether or not this was something Game Freak was hinting at with the lore or if he just made an educated guess while pulling the reasoning out of his ass is debatable.