Protect DAC from shorting out from BT receiver

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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?

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

????

Ask them what to do and which receiver to use. 

Regards