i think that he is misunderstanding the main essence of newton and einstain laws ,

thus when einstein said :"if the speed of the body increases and the speed of light increases, its mass increases , If we reach the speed of light the body mass becomes infinite and hence stops" ...............thats means if the body reaches the speed of light it will transfer as an energie . e=mc2
when newton said : " Newton said the body mass is fixed and does not change in the case of sleep or movement" .......he was talking about the potential energy of a body and which is SAVED as PERNOULI THEOREME .....because the potential energy includes the dynamic+pressure+....
total energie = dynamic energie " 1/2 m v square " + potential " mass * g* height

then don t confuse things