CMpilot1
I think you are talking about irreversible BUSS.When two ADRs are showing same value but wrong they will use that as correct rejecting the third and ELAC will use it to keep normal law erroneously. But since here all are faulty you switch off any two and aircraft will go in alternate law. The only data used is AoA for stall warning. The third is not switched off hoping for ice melting and recovery at lower altitude. But if it doesn't happen then the third is also switched off to get the BUSS which cannot be reversed.