The argument here applies the annunciation of a coming figure to the prophethood of Muhammad, peace be upon him. An important distinction is that being mentioned in a prediction is not the same as being declared divine.
On this reading Jesus speaks as a prophet who announces a later messenger, and the prediction is linked to the continuity of prophetic guidance. This is a classical Muslim interpretive claim; other religious traditions differ over the identity and interpretation of the Paraclete.
Scholarly caution is essential: the passage does not provide a critical collation of Greek Gospel wording, manuscripts and variant translations. Its theological inference should therefore not be presented as if it were itself a full textual-critical demonstration.