Are you also ascertaining that it is genuine and you agree to that fact that it could be good and that one cannot get scammed through it?
My first reservation about this is that I have never heard of the name of the exchnage mentioned by the OP. Well, I do not know if others know about it and can trust it.

My concern is that blockchain technology is meant to foster transparency. With the use of SMS to transact crypto, I see no transparency in it. Also, how do you know if your transaction has reached the intended destination?

The use of this method only makes things to be more centralized because someone somewhere will have to be in control of the actual funds on the blockchain, while the users are just busy sending mere SMS.

Except the government of Venezuela is just working towards the use of blockchain and somehow centralizing the system.