it's confusing because there are simultaneous discussions about species limits and nomenclature/type species etc.
anyway, as I understand it (please correct me if wrong) the latest position (incorporating the findings of several different papers up to and including Zuccon et al) is as follows:-
WESTERN SUBALPINE Sylvia iberiae (monotypic) Iberian Pen., s France, extreme nw Italy, nw Africa
MOLTONI'S Sylvia subalpina (monotypic) w Mediterranean, nw Italy
this has junior synonyms moltonii AND inornata (because the type specimen of inornata collected in Tunisia turned out to be migrant subalpina [Note - i've not actually read this paper apaprt from the abstract so going off what other people said])
EASTERN SUBALPINE Sylvia cantillans
with two subspecies
c, s Italy, Sicily = cantillans
ne Italy through se Europe to w Turkey = albistriata
IOC have accepted the split but they only update the list twice a year so this page
https://www.worldbirdnames.org/bow/sylvias/ hasn't been updated yet
I guess it remains to be seen whether they accept the new nomenclature or not
cheers,
James
EDIT: just seen Andy's post - i don't think that's quite right. As i understand it Moltoni's remains monotypic, inornata as a name disappears, and the N.African birds are merged into iberiae