Meta has never unlocked any device ;-)
CPU level 5 has exists since the Oculus Go and on Pico Neo 3 Link and Pico 4. Moreover, Pico use this level since a long time now and day one with Pico 4. These performance levels have always existed ;-)
Meta just limited developers to using these levels.
At first, developers could only use level 3. Then Meta created a buzz with the first improvements. This allowed developers to use level 4. And a few months ago, they did the same with level 5. And they again created the buzz, but it was a fake buzz. They didn't unlock anything. They just gave permission to developers to use levels that have always exists, but which Meta didn't want to use for fear of overheating or consumption, or just to create a buzz one day.
QGO has been able to use level 5 all along ;-)
Same thing for level 6 and 7 on Q3. Soooo many games, even new Q3 games still use level 4 and not 5 and so not 6 nor 7. Let's see an upcoming new unlocked power buzz...