Despite Amber and Luna departing from SM Entertainment, Victoria also announcing her departure from SME, and Krystal seemingly only still around due to her contract not expiring yet, Luna insisted on a recent livestream that f(x) were still a thing and not disbanded.
Sure, why not keep the hopes of fans alive? Cynically, probably in order to keep them attached to you.
Regardless, SME is known for rarely officially disbanding groups and if this is any indication, it seems like that trend will continue.