Why does Socius, an online journal, care more about length of papers than the validity of the research it publishes?
Because the Socius policy is for the editors to decide whether something gets published, and whether authors have responded to reviewer feedback (if applicable). Who knows what the reviewers on the original paper said. Maybe they did raise concerns. Maybe the guy who wrote the critique was one of the reviewers on the original paper. Maybe it was only "reviewed" by the editor.
How can people who publish in this journal actually count it as a "peer reviewed" publication?