From the landing video it looks like the aircraft was flying in direct mode
If they got into a degraded flight control law (eg something similar to A320 direct law)
I would like to hear from an Embraer 170/190 pilot as to whether they even have that.
They said they were IMC for a long time, if they had no attitude information they wouldn't know what was going on at al
You do know that all modern jet aircraft have a completely independent standby attitude reference system right? How long do you think they would last in IMC without attitude reference?
http://www.aviaddicts.com/wiki/ejet:iess