VCS is being used, so the criticism is unfounded:
"i would suggest that you ask questions first or be quiet
the postfix author is using a VCS but he do not need
to provide access to you or me "
Anyone can criticise anything for any reason.
Criticism is so easy to generate that it is worth absolutely nothing.
The process they use works for them.
I guarantee that I could come into your place of work and criticise pretty much everything you do, pointing out that there is a better way of doing it (because there will be, from some angle).
This is not useful, and whether or not I am correct on any specific point it is unlikely to be well received.