I don’t think he checks this forum a lot because it isn’t very active anymore. But to answer your question, yes. I bought one from him and installed it with no problems (it used to include instructions). It is the cheapest improvement and very cheap considering how much better it sounds.
Now, that is for the basic foglifter board. He doesn’t sell the foglifter+ as he needs to do that in his shop. And, he only sells one for the RM50 and RM100. You may know all this.
Anyways, reach out to him on Facebook or his website or even call him on the phones. He’s a really nice guy and easy to work with. Not some sort of pushy salesman type at all.