[Question - Chapter 4] dtype='int64' is not np.int64

[AlessandroMiola]

Hi Matt! First off, thank you for your amazing book! :)
I'm going through Chapter 4. I totally understand the discussion behind the nullable integer type.
Instead, I'm wondering why this sentence from Pandas documentation on Nullable Integer data type

Or the string alias "Int64" (note the capital "I", to differentiate from NumPy’s 'int64' dtype)

does not find confirmation in the following (songs2.dtype is np.int64 gives False):

songs2 = pd.Series(
    [145, 142, 133, 19],
    name='counts'
)

print(songs2.dtype is np.int64)

What am I missing and misunderstanding?

Thank you for your help!