Well, I don't (still) know what exactly those packages "optify", i.e. how they decide which file/folder to move away and symlink. It might be useful, but most probably not
From what I've been able to read from the .deb the script will check if the log has reached a certain size, and if so, delete it and start again. Probably this is what happened to you, and you just happened to notice that log file after the first log/previous logs had already been deleted.
If you find anything interesting, let us (at least me know!
dfree() { space=`df -B 1 | tail -1 | awk '{ print int($4/(1024*1024)) }' ` [ $? -ne 0 ] && return 0 return $space }