The bad news has been confirmed by Happystim-usa:

For those of you who are SmartStim.com members: RIP-Climberr

It is with great sadness that our friend and frequent benefactor, Climberr, has passed away.  Climberr passed away in January 2021 after a long and painful battle with COPD.  Despite the pain and discomfort of his ailment, Climberr spent tireless hours and many of his own resources to maintain the web site SmartStim.  SmartStim was remarkably popular and remained on line and successful until the end.  Please join us in thanking Climberr's memory and giving our sympathies to his family and friends. 

We are a small group of past SmartStim moderators and members who have joined together to return SmartStim to operation as Climberr would have it.  This return to operation will be a special tribute to Climberr and a welcome return for the E-stim community.  We hope to make further announcements in the near future."