No.
You have taken a conditional verse which was not directed to anyone specific and made it unconditional and applied it to specific individuals.
First, Christ is directing his word specifically to the apostles.
Second, I have not made anything unconditional. The apostles believed in Christ; they did greater things than he. That's the text; if you wish not to believe that, that's your prerogative.
Third, to the original point, Jesus ministered to Israel, begrudgingly and sparingly to anyone else. Proselyte and pagan conversions came later.