Does receiving anti-fraud SMS from graduate school mean being admitted?

There is no necessary connection between these two things.

My inference is that at least you applied to this graduate school, and the school certainly has your basic information, including your phone number. The college knows that there are quite a number of enrollment fraud cases in the society at present. Out of a responsible attitude towards the majority of candidates, we sent this warm reminder message to prevent fraud, so you received this message. However, there is no evidence to prove that the school has distributed it to all students who have applied for the exam, or only to candidates who have already applied for the exam.

Therefore, we suggest that you contact the college to consult the admission situation, instead of asking Baidu to know, because all of us don't know as much as you do.