Changing Majors As A Transfer (Civil Engineering to Mechanical Engineering)

I have been accepted to SDSU for civil engineering. I have been playing around with the idea of trying to switch to mechanical once I am officially enrolled. I know on the SDSU website it says that “transfers may not switch majors after being admitted”, but I have heard this maybe a scare tactic to prevent people complicating the admittance process. I get that it would be hard for say a communications major to switch to engineering major, but I would switching majors in the same college (engineering) with all the pre reqs complete for both majors. I would love to hear anyones thoughts or experiences on the matter.