You can access the wiki from the macrodroid application, it is available in version 5.15.x.I have seen many references to this wiki in the forums, but what's the url of it ?
See attached screenshot.I'm on 5.14.1 and don't see it.
There isn't newer version like your 5.15.3 available !
and quite strange thing is that Play Store lists as latest version 5.12.3 on April 6, 2021