there is no physical reason why someone could not travel at
c ... other than the capabilities of his propulsion system.

and there is no physical reason why his propulsion system could
not propel him to c.

claiming that there is a limit to the speed of physical objects
through the testing of the speed of light which has a speed limit
that is a result of its initial speed at the point of light emission
and the speed and direction at which the light source is moving
and the environment or medium that it then travels in is like
saying that a bullet that is fired from a riffle under water
from a fast moving submarine can not travel faster in the medium
of air above the water or even faster in the medium of space above
the air.

it is a untested pig headed claim.
and that is all it is.


3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.