So is this good news or bad news for Eth to be categorized as a commodity and not as a security?
It's obviously good news. The rules applying to securities are much stiffer, which is why several CFTC-regulated markets have launched since 2017 (LedgerX, CME, CBOE, Bakkt) but the SEC has rubber stamped nothing.
ETH was ICO - doesn't work as promised and goes PoS - Vitalik controlled, is even more what a security defines ( Shares = right to min and earn dividends )
It doesn't seem clear cut that an ICO
must be a security offering. (Most of them obviously are but that's neither here nor there)
As for POS, it's a (flawed) form of decentralized consensus administered at the protocol level. Why would that make it a security?