Radxa X4 20Watt TDP How?

I was watching ETA Primes review of the X4 and he got the TDP set to 20W and with it running cool, how do you unlock the TDP ?

Here it is : https://youtu.be/vpXvRCvjctg?t=432

I changed the Platform PL1 & PL2 Power to 20000, but when benchmarking In CPUz & Core temp never see the TDP go above 11.7 watts.

What am I doing wrong ? Is there another setting ?