Are you sure "offline" means that? Romania looks offline and when I checked their CNN they were reporting live from Spain about the blackout without mentioning Romania.
The map seems to be based on monitoring stations in the different locations, so yes - it's also possible that a station is offline for other reasons (maintenance, etc).
In any case, if I recall correctly from a Youtube video I can't find (it was either Wendover or Real Engineering), if the grid is fully down, it takes quite a lot of effort and time to bring it back online because it has to be done in small steps to avoid over/under loading/using.
