Foe a long time Buzz A denied seeing anything in space that was strange, now he has just come out and said he and the other crew members on Apollo 11 mission saw an object following them. They were told by nasa not to mention this to anyone. You have to ask yourself why they were told this!?.
That "interview" with Buzz was taken out of context and did not convey the intended meaning. (His words.) After the crew verified that it was not the SIV-B upper stage they concluded that they were probably looking at one of the panels from the separation of the spacecraft from the upper stage.
One of 4 panels that had been jettisoned prior to transposition and docking shortly after TLI, when the spacecraft was a couple thousand miles out on July 16.
The panels would have a sideward velocity imparted to them, which would provide an outward movement to them, while still maintaining the same relative velocity outbound. Thus, the panels would travel with the spacecraft, but with an outward angle relative to the CSM/LM line of flight. And these panels were NOT tracked from Earth. Could it have been an alien spaceship following Apollo 11, yes, but the most likely explanation is that it was one of those panels.