The name of this moderator is Grady Broyles.

They have:

1. Falsely asserted that pngs are lossy. (not good for the project)

2. Falsely asserted that pngs are locked at 96dpi (just plain wrong, esp for those wanting to print their pngs)

3. Abused their moderator status by blocking arguments proving his statements incorrect.

4. Engaged in personal attacks.

imho, this person is not fit to moderate the Inkscape G+ feed.

Thanks for your attention to this matter. :)

Here is a screenshot of the above: 

This was in response to my comment (which did not fit in the screencapture):