I got the impression that whoever posted this originally created it as a sort of puzzle or mathematics test, or to illustrate varying precedence over time. I do

I got the impression that whoever posted this originally created it as a sort of puzzle or mathematics test, or to illustrate varying precedence over time. I doubt if anybody is still alive from the time when BODMAS/PEMDAS wasn't universal so for practical modern purposes the equation is not ambiguous. In fact it isn't possible to write an ambiguous (valid) equation.