The official response was that these codes are/were sent out in order of booked flites-so the lucky ones to have got them in a sec with a flite just 2-3 weeks later were-well, lucky. I´ve seen on another general forum indeed postings that people got their QR just in time to still make their booked flite.
In general it seems to me that this Th-pass is easier and has a bit less burocratic annoying requirements as that CoE system