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SANZAR released the Super Rugby draw 2 months before the ARU released the British Lions schedule, and:
The Force were realistically the only team that could have played them on the date that they have been given because the Force have a Bye round the weekend before... If any other team had of played the Lions on that date it would have meant 3 games in 7 days.
The Reds gave up their Bye round to play the Lions, all the other Australian teams are playing that weekend..
The Reds and Force maybe able to keep their Wallabies, but the Tahs, Rebels and Brumbies are almost certainly not going to be able to keep them due to proximity to Test matches.