affect of collinearity on T-square

As per the schweser notes Collinearity would result in slope biased upwards and thus having a downward bias in T-square. As per the T-square formula T-square = (coefficient of slope)/Standard Error So shouldnt an upward bias in slope cause an upward bias in T-square value too?

T-square? T-square is a multivariate statistic. Surely that’s not on the exam…