If the new improvement just allows snooze message being synchronised within eM Clients, please modify the text in the blog article:
“Snooze and Watch for reply status synchronization for Exchange and compatible IMAP servers
Snoozed and Watched emails will no longer be stored offline in eM Client only, you can get notified at the right time on any device!” (eM Client 9 BETA has just landed! | eM Client)
I was very excited the new feature allows synchronisation of snoozed message on all devices, not only in eM Clients and the text in the blog article sounded very promising.