Wow man finally got it working, at least part of it thx to this post anyway
Which made me look at that tuto from like 6 years ago, and found out what was missing
these files need to be uploaded as well on the game server (ftp) and file permissions set to 777
as for the other comands like /help /statsme not sure yet how to enable them
but at least, /rank and /top20,15,5 are working marvelously + player is shown
that hlstatsx is running on the server.