Nothing you posted goes against anything we said. Do you want me to tell you what you are missing or are you going to figure it out?
Alright here is what you can't comprehend.
In the airlock, the sound goes away for a person standing at window. It's right in your quote. This is 100 percent expected.
When astronauts are working outside and bang on the outside of the ISS, the sound travels inside to where there is air. Thus sound can be heard inside the ISS. This is 100 percent expected.
And then the hammering is self explanatory.
sweet Jesus.......was that the big reveal ?
Sound travels through air and not through a vacuum ?
Your "we" have being insisting sound travels through solids in the vacuum then it can be heard once the sound reaches air,
All well and good in theory,
But now you are saying the sound disappears with the air, even when travelling through solids and back into an air filled environment where the observer is standing, and this is "to be expected" .
The small air lock is solid,
The attached air filled ISS is solid,
The distance for travel is small,
the sound was heard when air was present,
now in a vacuum no sound is heard by the observer in air looking through the window into the air lock that is now a vacuum,
you say "this is to be expected" at the same time as we should expect sound propagation through solids and back into air.
no one said sound can't travel through air in the ISS,
It was used by the "we" as evidence sound travels through a vacuum
The issue you accidentally forgot to comprehend was where is the"drum skin" phenomena for the astronaut, who is banging on the outside of the ISS, and it is silent.
seems to me you have tied yourself up into knots,
needing to avoid some issues whilst at the same time claiming both contradictory expectations are accurate

Contradiction amongst the "we",
Strawman arguments,
and evasion.
why am I not surprised.