This issue is addressed informally in the introduction to the authors paper available here [1]. The pivotal move that addresses your complaint head on is Theore

This issue is addressed informally in the introduction to the authors paper available here [1]. The pivotal move that addresses your complaint head on is Theorem 4.3. [1] https://www.jstor.org/stable/2695030 https://www.jstor.org/stable/2695030