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Updates are not offered when running macOS with the -no_compat_check boot arg. There are 2 x pre-requisites for obtaining Big Sur update offers: the SMBIOS of a Mac model compatible/supported by Big Sur (MBP11,x minimum). a SIP value that does not enable Apple Internal; it's disabled by default and must be kept disabled (bit #5 of SIP value, see here for details).

My IORegistryExplorer (ver. 3.0.2) save from today. I use Rehabman SSDT (modified) or my custom made DSDT. MacBook Pro.ioreg