Sorry, I would flag this in a code review. It's too easy to skip past this visually. Explicit if statements make it a lot more obvious what's going on. This is too much syntactic sugar.

You must not do a lot of C# code reviews? This syntax is used in every codebase. In fact if you don't use it Visual Studio will underline it as "code can be simplified" suggestion.

You've never seen something like this?

    MyEvent?.Invoke(sender, arg);