StudioLive AI Software Reference Manual V5, section 4.8.2. (Device Settings Tab: Lock Out Mode) says that "nearly every feature" gets disabled, which refers to the things happening in the digital domain of the board. Only the analog trims (gains and outputs) can still be changed. I would think that after locking the board you can press any button on the board with no effect, so loading presets therefore should not be possible. But if you want to know it precisely, open a support ticket.