I wish I could, but I can’t.
Since www.remarpro.com is very opaque about these sorts of things (legal reasons?), I installed “Plugin Security Scanner” to scan my site including this plugin (seemed the most current plugin scanner – Wordfence might be a good alternative but I didn’t want to add a bunch of unnecessary tables to my database that I’d then have to go in and remove just for this one test). It checks the WPScan Vulnerability Database. It came back negative.
I then went into the WPScan database myself: https://wpvulndb.com/plugins?get=A
This plugin is there, since Nov of 2015, but lists an older version (2.2.7) which has obviously since been patched as there have been several versions since then.
In short, doesn’t seem to be a good reason at all it was removed. Great.