I don't understand why this uses base 10. Why would a serious cryptographic primitive be based on base 10? Maybe I misunderstand the purpose of this paper? I

I don't understand why this uses base 10. Why would a serious cryptographic primitive be based on base 10? Maybe I misunderstand the purpose of this paper? It says in the paper that they also found a way to break it, unless I misread it. I only skimmed it, but I am confused as to the purpose of this paper. Are they proposing that this be used?