Protect DAC from shorting out from BT receiver

It might short what out?  And whatever it is, that sounds like complete bs 

Interesting. I had my vintage Sansui 7070 repaired last month; the external fuse was fine, but two internal fuses were shorted out. My repair guy, a vintage variety himself, was also wary of digital imputs, like my iPhone or the BT receiver. 
What do you think is reason I got that warning from both Schitt Audio on their equipment, and from my repair guy?

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