Reminds me of the tired light theory.
But a static universe has a lot more to explain than just redshift:
1. Where does matter income from
2. How is it that the universe hasn't gravitationally collapses already?
Further, his theory is that particle masses change over time. Where are all the heavier old electrons?
Or if he means all particles get lighter, by what mechanism? How have stars and chemistry remained stable over time if particles get lighter? That means chemical bonds lose energy, and atoms get bigger, but we've had DNA based life for billions of years, the chemistry must have been stable over that time.
Jason