Of course they are. Buybacks are just a way of augmenting the entry fees and MR are giving players FREE buybacks (courtesy of their Double Elimination spots.
When a player arrives at any Matchroom event they are given a detailed schedule of times, tables, opponents and every other detail of their match. This is all pre prepared (with contingencies) to enable maximum efficiency.
When MR promoted the World 9 Ball Championships in Cardiff, even the pre qualifiers, which I ran, catered for 500+ matches and gave players five chances of reaching the final stages where they played double elimination again.
All it requires is foolproof paperwork to make it run as smooth as silk