Is this pattern matching expression equivalent to not null

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The pattern-matching in C# supports property pattern matching.
e.g. 

if (requestHeaders  is HttpRequestHeader {X is 3, Y is var y})

The semantics of a property pattern is that it first tests if the input is non-null. so it allows you to write:

if (requestHeaders is {}) // will check if object is not null

You can write the same type checking in any of the following manner that will provide a Not Null Check included:

if (s is object o) ... // o is of type object
if (s is string x) ... // x is of type string
if (s is {} x) ... // x is of type string
if (s is {}) ...

Read more here.

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