Yes, this patch is for sparc.sun4v (UltraSPARC T1 Niagara processors) .and will not apply to sparc.sun4u of your Ultra-80 and Ultra-10 hosts.
This is a known problem had logged in change request 6441232 where patches for different sub-architectures were being recommended as they matched a generic realisation for BaseOS.SolarisCore" used in creating patch recommendations. A fix for the realisation should correct this for all patches in the future is still to be done.
I have now requested the metadata used for recommendations to be adjusted for this patch so it is no longer recommended on sparc.sun4u architecture. In the meantime it can be ignored.