I can understand the confusion.
The mode of operation of MDWS, to detect resynchronisation events between the modem and DSLAM, relies upon the metallic pathway being contiguous immediately prior to and post the event. If the metallic pathway has "just disappeared", as in this case, then a resynchronisation event may be logged but it is not possible to update the database. We must remember that there is a two stage process involved before any of us third parties can see the data as graphical plots . . . the harvesting software (DSLstats, in this case) and the database updating & displaying software (MDWS).
Perhaps I should also add that just like a physical broadband service, DSLstats, HG612_stats & MDWS are "best effort" software services. We have to accept that what can be deduced may need to be a compromise after the consideration various basic data sets.