Hi, i use the current version 2.8.1 (425) and i have exact the same problem since a longer time. The shortcut CMD-Space is forgotten after each restart of Alfred and resetted back to ALT-SPACE.
I can re-set it manual to CMD-SPACE and this works, but only until the next restart.
(Your tutorial https://www.alfredapp.com/help/troubleshooting/cmd-space/i have followed.)
What i can to?
Best regards
Michael