Those are still valid commands in MATLAB.
However if you do not happen to be using MS Windows with Excel installed, then you would get a warning that "Basic" mode would be used, and it would try to find B_STAT.csv which probably does not exist.
You can use
d1 = readtable(filename1);
to do the reading. You might need
d1 = readtable(filename1, 'readvariablenames', false);
The result either way would be a table() object, and then
REAL_B = d1{:,3};
