Meaning that they are within capacity (so that all students with 2.0 GPA can continue in their choice of engineering majors, i.e. no intentional weeding), but at least some majors are reaching or threatening to exceed capacity (so that the threshold for at least some majors will be increased to 2.5 GPA, i.e. intentional weeding, but less aggressive than at some other schools where a GPA as high as 3.5 may be needed for some majors).
Although a 2.5 GPA is relatively low (many employers use a 3.0 GPA screen as one means of reducing the number of applicants to choose for relatively scarce interview slots), frosh year carries the highest risk of low GPA, since not all students initially adjust well to college, even though they may earn better grades later in college. But that carries an increased risk of being weeded out of your preferred major compared to the current policy of needing a 2.0 GPA, if the policy change will apply to you if you attend.