Sounding like a native English speaker (any standard variety of English)
I disagree with the interpretation provided for this simple reason:
My boss's problem [singular] and My boss's problems [plural] are the simplest and most idiomatic way of expressing what ails the boss: one problem or more problems than one.
The "of the" point is just awkward. ...
The sentence on its own is ambiguous:
You can buy those shoes too.
It might be an order, or it might not be.
The following is an order:
Buy those shoes too!
Meanwhile, a suggestion would look different:
You could buy those shoes too.
The sentence in the question falls somewhere between those two, and cannot be interpreted without further context such ...