Existence of a tag does not indicate that all questions in that category are on-topic.
We are a math website first and foremost. If someone needs help using MATLAB, Mathematica, Maple, etc. for some particular mathematical concept, that's perfectly on-topic. However, we are not a help and support forum for "how do I code ___?" or "how can I open ____ file?" or "how can I use ?"
The question you reference is off topic by two accounts: Firstly, it has nothing to do with mathematics (only with how to use math software). Secondly, it is a product recommendation request (a.k.a. shopping question). Either one of those problems would be enough to vote to close on its own, but together they spell certain doom for that question.