To control the CPU speed when the turbo ratios are locked by the BIOS, open up the ThrottleStop TPL window, check the Speed Shift box and lower the Speed Shift Max value. At least this lets you control the CPU speed anywhere from 800 MHz to maximum speed. Hopefully this allows you to use your laptop without it constantly reaching 100°C. 
As I'm using windows 11 and the virtualization undervolt was locked some time ago. but using throttle stop I was able simply to get the CPU multiplier down to work 3.2 0r 3.3 GHz for all six cores and the cooling system was able to handle it. I had a PC performing all the games over 60 FPS even the most CPU-demand games. Had 0 events of thermal throttling. A couple of days ago I have updated bios to version 2.17.0 and found the change of CPU multiplier to be locked. Tried to go back to previous versions of BIOS but it's locked now even with previous bios versions.Found the PC to be useless now! I have never ever used AWCC before so gave it a try now and found it to be a useless piece of software. No more joy in gaming as while gaming CPU spins at max, temperatures spin at max 100 degrees, constant thermal throttling events. FPS dropped, games stuttering, lagging. It became just an office PC no more I can call it a gaming PC. As an annoyed customer of Dell, I was a fan of Dell and a fan of Intel but those two just lost another customer.
m15 R1, useless after getting undervolt locked, BIOS 2.17.0