I asked my friend to check it in the sim (haven't seen it by my eyes, so I'm not 100% sure).
Switched off Blue HS. Both ailerons operable (from Green HS). So my previous post was wrong. Thanks guys!
Now the interesting part:
Next ELAC2 was switched off (with Blue HS already offline). One aileron stopped operation!
Bottom line:
In case of HS failure BOTH ELACs can operate simultaneously - each moving one aileron. But, in fact, each ELAC is hard-wired to only one jack per aileron. So in case of Blue HS failure, ELAC1 cannot simply switch to Green jack on the left aileron and needs help from ELAC2.