I’ve read so many articles over my 50 years on this planet where they quote Tony that the down tuning for sabbath songs was due to his finger tips being chopped off in a sheet metal factory accident before he was set to record the first sabbath album. The tuning helped reduce tension on the strings and therefore let him play with his makeshift fingertips with less to no pain.
However, the first album is in standard A440 tuning with the exception of Wicked world which sounds like it was slowed slightly in a different Hz pitch.
Paranoid is all standard tuning except Planet Caravan, which again has a Hz pitch slightly less than standard A440.
Then, the next 4 albums are varying degrees of tunings from standard to drop C#, then back to standard tuning for Technical Ecstasy and Never say die (with maybe 1 or 2 songs in drop C#).
So what the hell are they talking about?