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If you look at MOST frozen foods they are no where near as nutritionally balanced as prepared flakes or pellets.
On a basic protein note not all fish demand high protein.
IMO freeze dried foods offer higher protein content(FD tubifex worms are aprox. 67% protein).
A quick check of all foods may leave many surprised.
I do feed frozen foods and that brand brine shrimp in particular.
They are fiber to clean my fish out IMO.
Again this is just another STRONG argument for a varied diet.
Meaning more then 3 types of frozen only or just flakes, different food TYPES.
FYI frozen mysis is around 10.7%.
Just got to get the fish used to them....