Yes, because the minister wouldn't have the authority to consider the national security implications step by step. Normally, the national security review is triggered, then the decision is made whether to go on to the second phase, the one provided for under section 25.2. Then the decision is made on whether to go to the phase provided for under section 25.3, and, lastly, an order may be made under section 25.4.
The amendment in question would require the minister to apply section 25.2, except for the information gathering process that normally takes place for the purposes of section 25.1 if the minister considers that the investment may be injurious to national security.