This is the first time you’ve introduced the term ‘requester’ and ‘invoker’. What are you referring to? I assume ‘requester’ is the ‘client’, because of the diagram you’ve included, but it is an assumption and would be much more clear if you stuck with the language of the diagram in your introduction. Also, because you said “This class [assume you meant Command] will then be invoked by the client”, it makes it sound like the ‘invoker’ is the ‘client’, but that’s not what the diagram says, hence CONFUSION.
Also, your code example should reflect all of the parts of the diagram e.g. Client, Invoker, Receiver and Command, as otherwise we can assume they aren’t important to the pattern. It will also add clarity to the diagram and your opening explanation.