This is not a 12900KF (8P) submission. This is a 12900KF submission.

8 cores isnt 8P? No E cores working im xtu.

12900KF (8P) is 8P / 8P+HT - 8 core category

12900KF is 8P+8E (+HT) and this CPU is in the 16 core category which means your result is divided through 16 like this submission  -  https://hwbot.org/submission/4953358

Xtu use 8 cores not 16 or 24. The active core count Shows 8 cores. So why it isnt a 8 core run.... i mean 8 cores are 8 cores.

Well do a simple test, disable the E cores and see if you score the same.