The current trial, called operational freedoms, is not mixed mode.
The current trial involves interleaved landings and takeoffs on the same runway, which is the generally accepted definition of
mixed mode, albeit in this case only involving one runway at a time (while the other operates in segregated mode) and only for limited periods.
What the trial isn't is
parallel mixed mode (sometimes confusingly abbreviated to simply mixed mode), which is the term used to describe simultaneous use of mixed mode on two or more parallel runways or, in ICAO-speak,
"mixed parallel operations".