I think there are 3 related issues.
1/. Decision to use 34L A6 as the remote location.
2/. Runway mode operated.
3/. Time to de-escalate the situation and return operations to normal.
Given MAS122 was an air-return then there was time to plan the intended remote location. The use of 16R as an arrival runway possibility influenced the use of 34L A6. Was the aircraft offered or did they require 16R? Either way then the aircraft could've been taxied to one of the other designated areas on 16L (lesser of two evils).
Given use the closure of 16R then the use of 16L seemed obvious however other options could've been considered. As mentioned, 16L ARR and 25 DEP or 25 ARR and 16L DEP seemed obvious.
Pleased that all are safe. If 1/. and/or 2/. were different then there should've less disruption overall.