the Pinatubo eruption was much stronger and in the NH, shooting SO2 into the atmosphere... this one is weaker, in the SH, and shot water vapor into the atmosphere. they're different
the -QBO favors blocking, the strong Nino itself favors blocking, and solar research is out. some say the ascending solar favors blocking, some say it doesn't. but overall, solar and the eruption are dubious at best, and the -QBO and Nino are known to be blockier
so to say that a strongly positive +NAO is favored is a bit much