Yeah we wouldn't want any speculation on a website with "Rumour Network" in its title, would we.
ILS 28L GP is Notam-ed U/S for the period.
Methinks they armed the APP instead of LOC, either accidentally or intentionally, and followed an either non-existent or falsely transmitting G/S. Then when they looked around and realized that perhaps being at 10ft radio altitude at 400 metres from the threshold wasn't the best plan, found it too late to recover.
Would be very interested in the cultural makeup of the crew.