You say it is just tired light but it is not. It is the case for physical light (ie matter), light is physical and must interact with other matter by definition. This can be proven (in my opinion has already been proven) in the laboratory.
Also, intrinsic redshitft (ie redhsift as a property of matter) has also been proven in the laboratory.
This "daring" physicist rightly questions scientific dogma of our times, problem is; he is probably set up to fail.