"Why the intense critical scrutiny of the DSA loadings?"
Ummm. Should I really answer that? Because if the load factors are poor then the demand is poor. That ususally means that the route isn't profitabel because you are below BELF. This focus is, surely, justified as an assessment of whether airlines are making money from DSA? If that continues, then either the airlines will have to drop the unprofitable routes (most airlines aren't, as far as I know, charities) or the airline itself will go bankrupt.
"Even if some DSA routes are struggling isn't this to be expected for a new airport?"
Don't know. Is it? You tell us. There haven't been many "new" airports in the last 15 years or so, so the market dynamics are probably little understood in the modern day.
"...one from Malaga was completely full"
Judging by the stats published by the CAA, it was the only one that was 100% full, then. One swallow does not a summer make.
It isn't anti-DSA, for goodness sake. I don't care which airports live or die. It's merely a comment on the "official" CAA statistics, which seem to show that load factors are not all they need to be at the moment. Average load factors of 30% over 1 month will mean unsustainable losses. Sorry idf you don't like it, but it's true.