Hi, Daniel,
The Salvador is lovely. One of its real advantages is that you can break up the mountain stages into short distances, and the accommodation is good.
I think that the only albergues still closed on the Salvador are the municipal ones in La Robla, Buiza, and Pola de Gordón. If you search some recent live threads, you‘ll see that people are walking and not having issues finding accommodation. There are pilgrims out there now, in fact one recent pilgrim reported a night when the albergue in Poladura was full. In August, this camino is likely to be busy (by Salvador standards). In past years there has been what I would call a “bed crunch.” That means that you may find 20 people trying to get a spot, so it’s not really a mob scene, just that the number of beds isn’t geared to peak summer walking. August is the most popular month for Spanish peregrinos, and that’s when the numbers rise.
But don’t worry, walking out there you are usually going to be alone and able to enjoy the solitude!