IIRC subs do emit noise when static. There were some graphs with noise vs. speed, and all subs, including Kilo, did emit some noise at speed zero. The noise was very small. The noise also did not increase until 5kts or so. Simply speaking static sub makes same noise as slow sub.
No transients like opening tubes are generated by AI subs, nor detected by any sub, AFAIK.
IMHO at 130m you simply detected you. Depends on the background noise. I literally crashed into Kilo once without detecting him, but it was stormy sea.
At 130m he could actually create a shadow on BB by masking background noise. Not that it is simulated in DW.
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