Doesn't look like it. He seems to make no mention of his relationship to Anymailfinder or Makesmail in any of his posts. [3] It also looks like he is working closely with "Clavain Skade" or that is a sock puppet since they seem to publish everything for them to repost.
[1] (My favorite) https://growthhackers.com/slides/30-brilliant-growth-hack-ca... [2] https://medium.com/@clavain [3] https://growthhackers.com/members/kullar/posts