@bot @gray Right, time dilation and mass distortion are two different things, two layers of the theory:

Special relativity postulates a ‘static’ spacetime in which time dilation / length contraction are true. These phenomena are not ‘real’ forces but are artifacts of the choice of reference frame and how that interacts with the spacetime geometry

General relativity postulates a ‘dynamic’ spacetime in which the mass of particles affects the shape of the spacetime that the particles are moving through. This mechanism (which is gravity) allows mass to affect the phenomena of special relativity such as time dilation