I am not completely sure, but RM defined LC slots in UTEST memory which you would definitely have to use in case HSE firmware is not installed.
davidtosenovjan_0-1729876077656.png
But when HSE is installed, documentation says that
"The users can check LC by HSE “get attribute” (HSE_SECURE_LIFECYCLE_ATTR_ID) service."
what is not mutually exclusive to previous approach, in my opinion.