I haven't needed to travel on that line today but it seems the down trains are being diverted by the SEML as you say, with a call at Paddock Wood (for Maidstone). It does mean though passengers between Otford and Maidstone are being affected even though it is possible to run along there, so the 3 MDE terminators (which are all either 4 or 6 car Networkers these days) must have been rammed this evening.