That's #FakeNews!!! Your picture is photoshopped! Here is tye original one:
Ah. Before a pause or an unvoiced consonant, all voiced consonants are pronounced the same as their unvoiced counterparts (Б, В, Г, Д, Ж, З become П, Ф, К, Т, Ш, С).
An analogy can be drawn. This is similar to how the -ed ending of a verb is always spelt the same, but still is pronounced differently in "booked" and "stayed". And if you are a speaker of German, you do not need any analogy whatsoever ;)