I think that EDGES probably didn't see a real signal is more or less the expectation of the field. I remember that the feelings towards the result at the time was quite sceptical, and it seems it didn't take long before someone discovered that the published result wasn't very robust: https://telescoper.wordpress.com/2018/09/03/edges-and-foregr...
The people from the follow up instruments are very polite about all this, which I guess makes sense if you've used the EDGES result to get money for your own antenna.
They don't necessarily depend on the EDGES result holding up, but may be to confirm/refute it. Even if your experiment refutes EDGES, you don't want to imply EDGES was utter bunk from the start, because if that was so why did you spend so much money bothering to test it? Your funding and project still depends on it having some credibility.
The people from the follow up instruments are very polite about all this, which I guess makes sense if you've used the EDGES result to get money for your own antenna.