To answer the original question that was posed (Do Tarnmatte and Alberich work in the game?):

Tarnmatte on the schnorchel - yes, definitely. Install it as soon as you can for protection from radar-fitted aircraft.

Alberich - don't know, never tested by me.

Alberich improved - probably not, can't find any evidence at all in a series of controlled tests for the XXIII and VII U-boats.

Stiebler.