What it means is that the methodology is scientifically correct/acceptable, given the current state of the art in terms of reliability, and that the conclusions drawn from the experiment are in line with the methodology used in that experiment.

Peer-reviewed science is nothing more than the best available science at any given time. It is not an end point. It does not mean that it is not subject to later revision in light of better methodology or more experimentation. See, e.g., theories of gravity which had previously been taken to be the best available knowledge were revised after Einstein's hypotheses regarding relativity were supported by experiments involving solar eclipses.

Kindly don't condescend to me. I am being thoroughly civil here.