Dodecanese Seaways has now put up a timetable for the next fortnight. It is just the Dodecanese Pride which leaves Rhodes at 8.30 and stops in Symi at 9.30 on Wednesday, Thursday, Friday, Saturday and Sunday.
The other two days of the week it gives Symi a miss.
So far no news on the Dodecanese Express or what happens to either/both in October.